GM TPI Wiring-Ron Francis Wiring TP-50 Chevy TPI Telorvek Fuel Injection Wiring: Our harness upgrades the 1985 through 1989 engines by running them on the 1990-92 Camaro or Firebird computer. Using the 1985-89 engine, the computer, prom, and knock sensor will have to be changed to 1990-92 components. TPI Wire Harness - Speed Scene Wiring TPI Wire Harness 1991 Y-Body design fits the Corvette engine and can also be made to operate the F-Body engines. The computers from this era have someting called VATS (Vehicle Anti-Theft System) this is removed on all Speed Scene Wiring harness through a computer process. The layout is uniform on all Stand Alone harnesses built from scratch. WIRING DIAGRAMS Repair Guide - AutoZone The following wiring diagrams are provided to help troubleshoot electrical problems and as a an additional source to help understand the complex wiring utilized by these vehicles. No attempt has been made to illustrate most components as they physically appear, instead, representations are used to simplify the diagram. TBI Wiring Harness – Affordable Fuel Injection Description. This is a basic TBI harness for all engines using ECM 1227747 and 1228746 type ECM-many others can be used. Basic connections are standard but it is easy to customize one for your needs. Larrys Electric - Universal Tuned Port Injection harness This harness takes care of the headaches involved with installing Tuned port injection on most all SBC engines or swapping a TPI engine into your vehicle, and makes for a much easier installation. Our harnesses are all made with top of the line copper strand wire.