LT1 Wiring Harness Fuel Injection Connection has the harness that you need and LT1 wiring harness . com has the price that you want. We custom build race car harnesses, classic car engine conversion harnesses, inboard v8 boat conversions, rock crawler harnesses, and many other applications.Place Order · Internet Links · Thank You LT1 Wiring Harness | eBay Fast Wiring Harness, Fast Main Lt1/ 301101. XFI Harness designed for engines whose sensors feature GM LT1 style sensors. Works well out of the box with GM LT1 applications as well as builds that are c..