If you were to change wiring harness. Would have use the entire car harness, probably gauge pod and maybe column from a pre-8plug engine. The ICM on the passenger fender takes the place of another circiut for the cooling fan, fuel pump relay and AC. These are in the body part of the 4plug car. So the best thing is to repin the the 93 car harness from stinger site. Just use the 87-88 turbocoupe computer if using the pre86 turbocoupe there is more wiring differences and the pre86 is a lower hp computer. Hope this helps. Maurice
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