The seven pin should be neutral start and reverse lights switch the four pin is to tell the PCM which gear you have selected and the four wires go to the PCM. Should be a white, grey, yellow and black with white. Also remember to make sure the black wire from the seven pin plug is grounded as it works with the four pin one
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Over 30 years wiring experience between cars and trade as an avionics technician in both Canadian Air Force and civilian aviation.
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Over 10 years of full Fiero engine swaps and harnesses building and still going.