I have a 96 Z28 that I converted to OBD1 a while back. I just started to tune the ECU and when we hooked all the cables up it said it could not communicate with the computer. We are using an old copy of mastertune that work on my friends 95 natural OBD1. Is there a certain harness change that I need to make to get this to work? Or should I just put my computer in his car to tune then replace?

Thanks

 

just bringing it back up. Any help would be great