I have an 89 T2 with a Knight Sport Spec 13BT-N374 Chip (N370 ECU, don't know may be modified) and turbo timer . The car had major wiring issues but did run. I found the O2 Sensor jumpered into the ECU with Speaker wire and celing fan wire nuts. The mazda diagram has the factory pin at 2-C but it was in a different pin when I got the car. Anyone know where the O2 is pinned to with this chip / ECU setup ????????????