GM Conversion Kit

The GM Conversion Kit by Painless Wiring is a compact electrical harness solution engineered for General Motors engine platform swaps and retrofit applications. This kit is specifically designed for enthusiasts and technicians performing EFI (electronic fuel injection) conversions on classic or modern GM powerplants, eliminating the guesswork of custom wiring while maintaining factory-level electrical integration.

Built to manage the electrical demands of modern fuel injection systems, the GM Conversion Kit consolidates sensor wiring, injector circuits, and engine control module (ECM) connections into a single organized harness. The design accounts for critical parameters such as fuel pump relay logic, oxygen sensor feedback, throttle position sensing, and ignition timing signals, ensuring cold-start reliability and drivability across temperature extremes. The harness itself uses weather-sealed connectors and abrasion-resistant sheathing rated for underhood vibration and thermal cycling.

This conversion kit is essential for builders upgrading to modern engine management on a wide range of GM platforms, including Gen I–IV Small Block Chevrolet and LS-family engines. Its plug-and-play compatibility saves hours of bench work and troubleshooting, making it an ideal choice for those looking to standardize a non-OEM mill into a GM chassis.