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if i understand your question right you need the right ecu for the right year engine and the right year wiring harness, the difference in the ecu's is the plug in's, i belive 87-88, 89-92 are different ecu's and harness's
(dont quote me on that:) anyways when you get your engine and know the year it was made you can then get the right wiring harness and ecu
hth
 
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