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In-Store Pickup Location

AEM Electronics X-Series Wideband UEGO Air/Fuel Sensor Controller Gauges 30-0300

AEM Electronics 30-0300 - AEM Electronics X-Series Wideband UEGO Air/Fuel Sensor Controller Gauges
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Gauge, X-Series Wideband UEGO Air/Fuel Sensor Controller Gauge, Digital, 8.0:1 - 20:1 Air/Fuel Ratio Range, 2 1/16 in., Black Face, Red Numbers, Kit

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Brand: AEM Electronics

Manufacturer's Part Number: 30-0300

Part Type: Gauges, Digital

Product Line: AEM Electronics X-Series Wideband UEGO Air/Fuel Sensor Controller Gauges

Summit Racing Part Number: AVM-30-0300

UPC: 840879024437

Gauge Style: AEM Wideband UEGO

Gauge Series: Digital

Gauge Type: Air/Fuel ratio

Gauge Range: 8.0:1-20:1 air/fuel ratio

Shape: Round

Gauge Size (in): 2 1/16 in. diameter

Gauge Size (mm): 52.39mm diameter

Sweep: Digital numeric

Sending Unit: Electrical

Gauge Face Color: Black

Gauge Number Color: Red

Bezel Finish: Black

OEM Replacement: No

Sending Unit Included: Yes

Quantity: Sold as a kit.

Notes: Includes Bosch LSU 4.9 sensor, wiring harness, faceplates and sensor bung.

In-Store Pickup: Choose In-store pick-up (OH, NV, GA, TX) on our web site.

For fast response times, AEM X-Series wideband UEGO air/fuel sensor controller gauges are the way to go! Built on the unique, patent-pending X-Digital technology, they report accurate information quickly— enabling you to tune your engine more efficiently. These gauges have modern, visually striking faceplates with 7-segment center displays that are 87 percent larger. They're ultra-slim and come with black bezels and black dual-faced faceplates for air/fuel and Lambda. The displays are user-configurable and feature auto dimming.

Additional features:

* Bosch 4.9LSU wideband UEGO sensor
* Factory-calibrated resistor does not require free-air calibration—but technology allows for free-air calibration as sensor ages, if user desires
* Compatible with vehicle/system voltages up to 16 V
* 0-5 V and RS232 output for data-logging and feedback control
* AEMnet (CANbus) for data-logging and daisy-chaining multiple controllers up to 16 cylinders
* Can display AFR values in hundredths of a percent
* 52mm gauge diameter and slim 0.825 in. gauge depth
* Gauge cup depth only .200 in. deep
* Locking connectors


Questions & Answers Ask a Product Question

do I need two kits one for left side and one for right, or just two o2 sensors??

Asked by RICHARD on August 16, 2017


One kit for each side. However I would look into a kit that has a dual sensor input.

STEVEN D from FL answered on August 31, 2017

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I have a 2006 LS2 GTO.Rear O2 sensors are turned off.I would like to know if I could thread the WB O2 fitting into the rear sensor O2 bung and get an accurate reading.I'm running long tube headers with catless mid pipes.

Asked by RANDY on November 20, 2017


Hi Randy, thanks for your question. Ideally, you want to mount the sensor 18-24" from the exhaust ports to minimize deadtime, but if you have unused bungs available on your headers there should be no problem mounting the sensors in them. Please make sure that the bungs have been installed so that the sensors are positioned at an angle per the instructions. This will prevent condensation buildup on the sensor when the engine is turned off, which will ensure the life of the sensor is not shortened prematurely.

AEM Electronics AEM Electronics Answer - November 21, 2017

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How close can you install this 02 sensor to the cars
main ecm 02 sensor ? From the end of my shorty headers
to the top of the cats room is very tight! I may have to install this 02 sensor after the cats .

Asked by TOM on November 29, 2017


Hi Tom,
You will want to install the sensor 18"-24" down the collector pipe, at an angle that is illustrated in the instructions to prevent condensation build up on the sensor when the vehicle is off. You can install it further but it will affect the deadtime slightly.

AEM Electronics AEM Electronics Answer - November 30, 2017

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Does this work well with boosted applications? And is it compatible with ms1

Asked by BLAKE on January 04, 2018


Hello Blake and thanks for your question. The 30-0300 X-Series Wideband UEGO AFR Gauge performs the same whether on a naturally aspirated or boosted engine. You will need to mount the sensor post turbo per the instructions. X-Series Widebands have a 20ms average response time, which is independently tested to be the fastest available wideband against 17 other controllers. This allows the X-Series to report transient changes in AFR that other controllers may miss, which will provide you with data and/or feedback control to get the best possible tune. As long as the MS1 has analog inputs there should be no issue connecting the X-Series Wideband Gauge to it, since it has a 0-5V analog output for logging and feedback control. We also publish our CAN bus protocol (AEMnet), so if MS has provisions for CAN and accepts 3rd party CAN data, then you can also configure it to the MS1 via CAN. You will need to check with them on that, though.

AEM Electronics AEM Electronics Answer - January 05, 2018

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