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Holley offers several coolant temperature sensors designed for use with their Pro-Jection, Sniper, and other fuel injection systems. They feature brass construction with 3/8 in. thread and will provide the ideal fit and function to monitor your engine's coolant temperature. Select the one designed for your system.
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$37.46
$33.71
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$51.75
On Sale
Holley offers quality service parts for use with the Holley 8-channel EGT monitoring kits, including EGT (Exhaust Gas Temperature) probes. These thermocouple sensors provide the perfect solution for viewing and logging various temperatures, including exhaust gas and cylinder heads, to keep you in-the-know of what exactly is going on in your engine. Select the probe needed. Features and specs include: * Stainless steel over-braid cable with lead and pre-terminated connector * 1/4 in. EGT probes (pyrometer type) * 90-degree, open-end tip * Available with different length harnesses
Not Yet Reviewed
$125.95
$113.35
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$125.95
On Sale
Help your fuel injection system keep up on measured pressures with these Holley replacement pressure transducers. They include a wiring pigtail, are available for all Holley EFI fuel injection systems, and come in different pressure ranges to suit your engine application requirements.
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$199.95
Holley Terminator X MAX engine control modules are standalone units intended for use as service components for your Terminator X EFI installation. Each X MAX ECU features real-time fuel learn, high-impedance injector drivers, an integrated 1 Bar MAP sensor, electronic transmission control, drive-by-wire throttle body control, and four programmable inputs and outputs. The inputs and outputs are ideal for electric fans, boost control solenoids, progressive nitrous control, and much more. Order your Holley EFI Terminator X MAX Service ECU today. Features: * Compatible with all Terminator X harnesses * OEM (Original Equipment Manufacturer) injectors supported with part numbers provided in the handheld wizard or software * Bosch LSU 4.9 wideband control (will not work with LSU 4.2 oxygen sensors) * Eight built-in multi-color diagnostic LEDs allow you to quickly identify a variety of potential system issues, such as: -- A failed TPS (Throttle Position Sensor) Autoset -- Faulty crank or cam sensors -- Potential oxygen sensor issues * Built-in 1 Bar MAP (Manifold Air Pressure) sensor -- On boosted applications, you can disable the internal MAP sensor and utilize an external MAP sensor * Four inputs—12 V, Ground, 5 V, and Frequency for things, such as: -- Additional pressure sensors -- Activation triggers for nitrous activation -- A trans-brake (fuel and oil pressure inputs are pre-terminated) * Four outputs--Ground, PWM, and accessories, such as: -- Fans, boost control, nitrous control, IAC kit, and more * GM LS and LT, Ford Coyote, and Mopar Gen V drive-by wire throttle body control * GM 4L60 and 4L80, and Ford 4R70W transmission control * Boost Control: -- Boost vs. Time/Gear/RPM/Speed, and boost safeties * Nitrous Control: -- Single channel of wet or dry -- Progressive or non-progressive -- Rich/lean safeties -- Target closed loop AFR * Advanced tables: -- Four 1D tables -- One 1D per gear table -- Four 2D tables -- One 2D per gear table * Free EFI tuning software for complete control of your Terminator X powerplant
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$1,199.95
On Sale
Holley Sniper EFI HyperSpark CD ignition boxes are the perfect ignition upgrade to complement your Sniper EFI installation. With minimal wiring, these units are ready to plug-and-play with your Sniper system. Holley Sniper EFI HyperSpark CD ignition boxes feature: * 135mJ of spark energy when used with the HyperSpark ignition coil; ensures complete combustion * Box is sealed and powdercoated to be installed in the harshest of locations * External LED helps verify 12 V, cranking rpm, and low battery voltage * Very low key-off current (<150uA); your battery won't drain during storage periods
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$399.95
$359.95
Holley Terminator X engine control modules are standalone units intended for use as service components for your Terminator X EFI installation. Each ECU features real-time fuel learn, high-impedance injector drivers, an integrated 1 Bar MAP sensor, and four programmable inputs and outputs. The inputs and outputs are ideal for electric fans, boost control solenoids, or progressive nitrous control. Order your Holley EFI Terminator X Service ECU today. Features: * Compatible with Terminator X harnesses * OEM (Original Equipment Manufacturer) injectors supported with part numbers provided in the handheld wizard or software * Bosch LSU 4.9 wideband control (will not work with LSU 4.2 oxygen sensors) * Eight built-in multi-color diagnostic LEDs allow you to quickly identify a variety of potential system issues, such as: -- A failed TPS (Throttle Position Sensor) Autoset -- Faulty crank or cam sensors -- Potential oxygen sensor issues * Built-in 1 Bar MAP (Manifold Air Pressure) sensor -- On boosted applications, you can disable the internal MAP sensor and utilize an external MAP sensor * Four inputs—12 V, Ground, 5 V, and Frequency for things, such as: -- Additional pressure sensors -- Activation triggers for nitrous activation -- A trans-brake (Fuel and Oil Pressure Inputs are pre-terminated) * Four outputs--Ground, PWM, and accessories such as: -- Fans, boost control, nitrous control, IAC kit, and more * Boost control: -- Boost vs. Time/Gear/RPM/Speed, and boost safeties * Nitrous control: -- Single channel of wet or dry -- Progressive or non-progressive -- Rich/lean safeties -- Target closed loop AFR * Advanced tables: -- Four 1D tables -- One 1D per gear table -- Four 2D tables -- One 2D per gear table * Free EFI tuning software for complete control of your Terminator X powerplant
Not Yet Reviewed
$849.95
On Sale
Holley Sniper 2 EFI input/output wiring harnesses give you access to two ground trigger inputs, two ground trigger outputs, the points output, tachometer output, and digital gauge output wires. The input grounds can be used for things such as AC Kick and nitrous stage activation. The output grounds can be used for electronic fan control, or A/C shutdown at WOT. This harness includes an additional 0-5 V TPS output commonly used for transmission control units, and a tach output wire to drive most common aftermarket tachometers. Additional details: * Wires come individually labeled for easy identification * 4 x 5 ft. long output wires * 2 x 5 ft. long input wires
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$80.49
$72.45
On Sale
With performance engines pushing redlines up higher and higher, alternators are being forced beyond their design. Holley's premium alternators can tolerate 30 percent higher rpms than conventional models. The attention to cosmetic detail on these units is above and beyond what you would expect, too. The entire outside housing has been sculpted for a smooth silhouette that hides the ugly details we typically think of as alternators. If you drag race, autocross, or just hot rod your ride, be assured that Holley premium alternators won't fly apart on you. Features: * Available in natural, black, and polished finishes * Works with all Holley accessory brackets, as well as 4th generation F-body, most 1998 thru 2004 GM trucks, and many other applications * 150 amp output * Smaller and lighter than Holley high-amp alternators * Housings are smoothed to make polishing clean (no buffer cut marks trying to get in tight corners) * Rear cover is aluminum instead of typical black plastic * Ideal when size and clearance matter * Black and polished pulley covers are available on models that don't already include them * Designed for use with Holley alternator weatherproof pigtails (not included)
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$534.95
$480.95
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$649.95
On Sale
The pressure inside the intake manifold is an extremely important input to the engine control unit. Holley Sniper MAP sensors respond to changes in manifold pressures and relay the information to the ECU in the form of a voltage signal ranging from 1-5 volts. These replacement sensors will handle applications up to 25 lbs. of boost. Additional notes: * Utilizes stock attaching points * Sensor monitors manifold vacuum, varying output voltage to the ECU as a function of load placed on the engine—providing necessary data to control fuel enrichment
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$35.65
$32.09
On Sale
Holley ECU mounting brackets allow you to comfortably install either the Dominator ECU, Holley HP, Terminator X, or Terminator X-MAX under your Mustang's front passenger seat. They're designed to work with stock seats and seat tracks (modified/race seats may or may not accommodate them). You simply route all your ECU harnesses through the firewall--properly route the wires, install the unit followed by the ECU, and then reconnect your wires and go! Use your laptop to fine-tune the ECU without popping the hood and protect it from engine bay heat with Holley ECU mounting brackets. Order the brackets recommended for your application.
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$110.95
$99.85
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$103.95
On Sale
Holley products deliver the edge you need over the competition. Their Ford modular ignition coil harnesses offer true plug-and-play performance by using OE-style connectors to hook up to your factory coil packs, sensors, or control unit without any modifications. Among other functions, fully connected ECUs allow you to precisely regulate the fuel and ignition of your engine. These Holley complete harnesses enable applications with a single power adder to accommodate a greater number of controls. Order the model designed for your vehicle/engine.
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$219.95
$197.95
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$649.95
On Sale
Holley EFI Digital Dash I/O adapter with wiring harness kits offer more performance from your digital dash. Available terminated or unterminated, these vehicle harnesses provide 10 additional inputs/outputs to your 7 in. unit. They can be configured for gauges or switches and data-logged locally through your digital dash. The adapters bring out connections to a waterproof 26-pin connector, similar to ones used on EFI units, and the kits include a USB memory stick to update digital dash firmware that supports the adapter.
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$349.95
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$399.95
$314.95
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$359.95
Holley wiper switches are 5-blade, 2-speed units with an internal 6-amp circuit breaker at 12 V DC. They feature a black with white imprint plastic knob with metal insert. Additional features and specs: * Electric 2-speed wiper switch with push-to-wash * Plated steel case 1 3/8 in. (34.9mm) diameter, 3/8 in. (9.5mm) long * Mounting stem 7/16 in.-28 thread, .38 in. (9.6mm) long
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$49.95
Holley Single-Channel EGT controllers are designed for use with a K-type thermocouple using a "mini-K" connector. The module's accurate temperature measurement range is 32-2,282 degrees F (0-1250 C), with an accuracy of +/- 5 degrees F. The module is available in two versions: either CAN 1CH EGT, which is a plug-and-play installation for compatibility with Holley EFI products, such as HP and Dominator EFI systems; or Analog module, 1CH EGT with a "flying lead" with three wires exposed for power, ground, and signal for non-Holley EFI installations. Order the EGT controller suited to your application needs. Plug-and-Play, 1CH EGT controller features: * Supplied harness features two CAN connectors (one male, one female) that plug into the Holley main harness (or P/N: 558-412 kit Dominator only) * LED: Green LED indicator on unit shows solid green color to signify device is operational; flashing LED alerts no thermocouple connected or it failed * Note: before mounting, it is recommended you record the CAN ID Serial number from the sticker on bottom side of the unit for use during software setup * Mounting: EGT module is designed to be installed with zip-tie or a pair of #6 or #8 screws * Software setup * Important note: Requires software and firmware Version 5 Build 31 or later Analog module, 1CH EGT controller features: * Wiring: harness is a "flying lead" with three wires exposed for power, ground, and signal (red wire: power 6.5 V-24.0 V; black wire: ground; and tan wire: Analog output) * Outputs a 0-5 V and can be used with systems that have configurable 5 V inputs * LED: Green LED indicator on unit shows solid green color to signify device is operational; flashing LED alerts thermocouple not connected or it failed * EGT module is designed to be installed with zip-tie or a pair of #6 or #8 screws * Analog setup: analog output scaling is accurate between 0.5 and 4.5 V and covers temperature range of a K-type thermocouple
Not Yet Reviewed
$182.65
Want to make the switch from the original Sniper EFI to Sniper 2 and don't want to rewire your system? This harness is designed to do exactly that! The Holley Sniper adapter harness is a plug-and-play solution to connect your existing Sniper 1 wiring harness to a Sniper 2 throttle body! It can be used with any Sniper 2 system that is not equipped with a power distribution module (PDM). Simply remove your Sniper EFI throttle body from the intake manifold, unplug all of the connectors, and plug the Sniper EFI 2 adapter harness into your existing main harness. Cycle your ignition key, run a fresh wizard on the display of your choosing, and enjoy the benefits of Sniper EFI 2. Make the switch to Sniper 2 in minutes! Sniper EFI 2 is a high performance electronic fuel injection system designed for a wide range of engines and horsepower goals. It provides improved engine performance, better fuel efficiency, and easier starting, making it the perfect upgrade for any enthusiast looking to take their ride to the next level. With its easy installation and advanced technology, the Sniper EFI 2 is the ultimate fuel injection system for any conventional V8 engine. Features: * Update your Sniper 1 to Sniper 2 in less than an hour: One-step, plug-and-play upgrade from your existing Sniper EFI install to a Sniper 2 throttle body * Eliminates the need to rewire your existing Sniper EFI installation * The wiring harness included with the Sniper 2 kit will not be used. This adapter is intended to be used with the original Sniper EFI wiring harness and new Sniper 2 EFI throttle body Sniper 2 EFI benefits: * (NEW) Next Generation ECU features improved RF noise and interference resistance (stands up to old car wiring, noisy alternators, faulty plug wires)  * (NEW) "Hidden Harness" wiring harnesses exit from the rear of throttle body for a clean appearance  * (NEW) Inputs and outputs consist of: 2x ground inputs, 2x ground outputs, 1x TPS output (0-5 V) and 1x tach output  * (NEW) Next Generation mil-spec style M8 positive lock connector for CAN1 and CAN2 provides the latest in CAN bus technology for a simple yet robust connection 
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$56.09
Bolt-on Holley replacement Terminator EFI engine control modules, answer a few basic questions, and let the Terminator EFI take control of your ride! The modules require no laptop--they self-tune instantly to deliver the perfect air/fuel mixture in real time for optimized fuel economy and power.
Not Yet Reviewed
$2,199.95
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