5.0 Swap: Which Wiring Harness | Mustang Forums at StangNet Mar 19, 2015Would a 1989 5.0 fuel injection wiring harness be a good harness to use for a 5.0 swap into my 67 mustang? How do I know if its a 1989? Thanks, RangerMake A 90-93 5.0 Engine Harness Work With A 89 DashOct 29, 2017Coyote Swap | Mustang Forums at StangNetAug 27, 20165.0 Swap Wiring Harness Mod Question | Mustang Forums atJun 02, 2006Painless wiring harness for 4cyl-5.0 swap? | MustangSep 05, 2005See more results 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. These are the steps I went through to run the motor shown to the right.