I just built a 91 crx hf. Put a obd1 gsr b18c. Got all the codes gone, except 5, which is map. I put a map sensor from the salvage yard in. Didn't work. Manually wired up the map sensor to the computer. It's a p72. Still throws the code, Is there anything that it could be besides the ecu? Oh yeah, I tried all different wire combinations between the 1.power 2. signal 3.ground. Help is greatly appreciated.