TBI Wiring Harness | Affordable Fuel Injection 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. Typically, technical support is limited to the customer with only a harness purchase due to the complexity of variables we have no control over. TBI Harness: Car & Truck Parts | eBay EFI Wiring Harness - GM TBI Injection 1986-93 - GM V6 / V8 - Kit. Product Details. PAINLESS WIRING 60101 Tbi Harness. AT RACING WORLD, 5 Million Orders Shipped Worldwide. $464. 4bbl Holley TBI injector harness for HP EFI & Dominator EFI. M&H Electric 0067108 Vinyl Wire Harness Wrap Tape, 1955 - Present. Tech Support.