I just got my new engine set in, im putting a tpi on my 91 that was tbi. I converted a 89 mass air to map. It will crank but will not start. This is not my concern right now. While diagnosing the no start, my oil pressure guage reads zero while cranking, so I checked my connector and tried to start the car with the connector unplugged. CAR WILL NOT CRANK UNLESS THE OIL PRESSURE SENSOR IS PLUGGED IN. I want to figure this out before i go any further into the no start. Any ideas? I did find that the signal wire is the problem, if I connect the sensor, but unhook the signal wire, it wont start. If I hook it back up volia it cranks......... I have no idea where to go from here.