Classic Instruments Tap Shift Switch Modules

Classic Instruments tap shift switch modules are aftermarket control boxes that add manual "tap shift" control (upshift/downshift with a switch) to modern GM 6L80, 8L90, and 10L90 automatic transmissions, enabling them for engine swaps into older vehicles. The modules wire into the CANbus system and require a compatible GM ECM/TCM tune, providing features like a neutral safety switch and reverse light output for custom setups. In short, these are a translator box for your engine's computer, letting you control your modern automatic transmission manually in a custom project.

What the product does:

* Adds tap shift: Allows you to manually change gears (up/down) using small toggle or micro-switches instead of a factory shifter
* Adapts transmissions: Bridges the gap for using modern computer-controlled GM transmissions (like 6L80/8L90/10L90) in classic cars or custom builds
* Provides safety features: Includes a ground output for a starter relay (preventing starting in gear) and an optional negative (-) signal for reverse lights/backup cameras

Key requirements:

* Compatible GM TCM/ECM: Needs a proper tune (often a Corvette or Camaro tune) for the module to function, as it communicates via the vehicle's CANbus
* No DTCs: No Diagnostic Trouble Codes should be present in the ECM/TCM for tap shift to work
* Switch inputs: Supports various inputs, typically "pull-to-ground" or "positive-pull-to-12 V" switches, with negative being preferred
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