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I currently have a 1993 Ford Mustang LX that I am dropping a 1991 5.0L into. It was a 4 cyl car. What I am trying to determine is if I should be getting a 1993 or 1991 Main Engine Wiring Harness? If someone could please advise me as to which is the proper to get I would appreciate it.
 

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89-93

Any 89-93 mass air harness should work. You'll still have to splice a few wires, I am sure. Get the EVTM manual from Helm, Inc for your mustang - will have 2.3 and 5.0 diagrams to mix and match from. If you get stuck PM me.
 

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91's had the fuel pump relay under the drivers seat, and the 93's had them under the mass air meter.
A friend of mine had a problem with no fuel pressure when he put my 91s harness to his 93. We messed with some wiring and moved the wires to under the MAF.
Just some food for thought
 
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