I'm gonna be putting my kit together in the next 2 weekends. I have a D16Y7 so OBD2. I have a chipped P28 with a base tune by st00pid (Neptune). I also have the OBD2 to OBD1 conversion harness. I'm using a Spoolinperformance mani and DP.

Here's where I need your help guys. The DP only has one O2 sensor bung (hole) he he! So which O2 sensor is read/used by the ECU? I guess the one before the cat. If anyone knows, please post the answer. Or I can find out by trial and error but I'm hesitant cause I don't know how the car will run.

 

the O2 before the cat is used, the one after the cat is there only to make sure the the cat is doing it's job. but since your switching to OBD1 you will not need the one after the cat.