Swap the harness from the car with power stuff. The only harness you will need from the v8 car is the engine harness. Good that they are both 91s btw or youd run into issues. The 91s use a 1 year harness.
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2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.