mustang 5.0 wiring harness | eBay www›Search›mustang 5.0 wiring harness87 88 FORD MUSTANG BODY WIRING HARNESS 5.0 302 ENGINE GT & LX HATCH. Ford. $179. Was: Previous Price $199. Buy It Now. Free Shipping. 39 Watching. 10% off. SPONSORED. 1989 Mustang Gt Lx 5.0 Mass Air Ecu Pcm Engine Computer Wiring Harness. Mustang. $185. or Best Offer +$16 shipping. 86-93 Mustang Gt Lx 5.0 Fuel Injecter Wiring Harness. Wiring a Fuel Injected 5.0 into a '65 Mustang Wiring a Fuel Injected 5.0 into a '65 Mustang . The purpose of this page is to describe the wiring modifications necessary to install a 87-93 SEFI 5.0 into an early model Mustang.