TBI Wiring Harness – Affordable Fuel Injection TBI Wiring Harness. Starting from 265 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 Amazon: tbi wiring harness Michigan Motorsports Oxygen O2 Sensor Extension 24 inch Wiring Harness Fits TBI TPI 305 350 Chevy Camaro Corvette. 5.0 out of 5 stars 1. $9 $ 9. 95. Get it as soon as Fri, Oct 18. FREE Shipping on orders over $25 shipped by Amazon.