Why would you want to change it back is a better question. OBD1 is much better for modding when it comes to tuneability. If you don't plan on doing any future mods to the car then you could convert it back by getting rid of the jumper harness (the wiring mess you said was plugged into your ecu), put an obd2a ecu back in the car (96-98 Integra), obd2 distributor...personally I would just leave it as is