90DATeg
New Member
I have a 90 DA with a pr4 ecu. I just put in a Apexi VAFC. I know its not good for tuning at all but I just wanted to see some parameters of a few things before I went to a fully tunable ecu. I ran into a snag. I can't locate the RPM signal wire on the ecu harness. I've looked around and I heard one guy said it might be the B20 connector but it wasn't it. Any help would be appreciated. Thanks in advance. I also have checked the ecu pinout diagram and it's not labeled.