I a 89 hatchback dx with a 3G dohc zc, it still has the stock ecu in it. I plan on getting a PM7 ecu for it..I still need to mod the harness for the mpfi or not? I imagine I would but if not id like to know before I take the time in doin it, and will the resistor box thats in it work or should I change that too? The guy that did the swap did a poor job. Any info would be greatly appreciated. Thanks!