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Get an obd1 p75 and you will not need to do any other modifications. That harness will plug into your car's existing wiring.ok to everyon its a 97 b18b engine i have the harness and everything and i have a obd2a p75 comp....its goin into a 93 hatch what elctrical mods shud i need...im hearing many things such as using a obd1 computer and just gettin a harness...but i wanna make sure its right let me know....