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.Chevrolet · Toyota Amazon: tbi wiring harness Amazon: tbi wiring harness. Quick Fuel Technology QFI-500BD Fuel Injection Base Kit Incl. TBI Assy/Handheld Controller/ECU/Main Wiring Harness/Laptop Cable/Sensors/Hardware Black Diamond Fuel Injection Base Kit. $2,178 $ 2,178. 94. FREE Shipping. Only 1 left in stock - order soon.