I have an '89 2wd Saph and I am really interested in getting a closed loop system and a coil pack conversion fitted. My question is are both systems compatible with the ECU I have or do I need to change to a different one. I have seen several posts and several different ECU numbers flying around and it confused me as I haven't got the foggiest as to what ECU I have or what I need.

I've already had a boss welded on to the exhaust pipe and I have a lamda sensor fitted to run my AFR gauge (even though this seems to respond to the stereo more than the sensor)