Take the pain out of wiring a 1986-93 Ford 5.0L or 5.8L engine in your race car, street rod or truck. Painless engineers have reduced the bulky, multiple OE harnesses to a single, lightweight harness that is streamlined for performance. This harness uses original Ford connectors for reliability and ease of installation. Plugs directly into stock computer with no additional reprogramming required. For use with Mass Air Flow Systems.
A mustang harness will not work if he is running a normal 5.0 because it will be most likley Speed Density and not Mass Air like mustangs things would need to be changed I have heard alot of good things about www.fordfuelinjection.com I was thinking about going that route but i have the whole harness so I wont need too.