My 97 has both ports too, and I'm running a 95 Calum ECU w/ no problems. Plus, in NY they plug in the OBD II connector to check for codes for inspection, and it communicates w/ the 95 ECU fine, and it seems much easier to pass this w/ a 95 ECU vs a 97 as I believe there are less codes the 95 will throw, like EVAP.