Hey guys, I have a 91 4x4 pickup with a manual transmission. I recently swapped a better condition 89 22re and pulled the existing 22re.

The engine purrs but I cant get the oil pressure sender working!! The new engine came with a oil pressure switch, I removed it and installed the old oil pressure sensor/sender; resulting in the needle not moving in off/low position.

I rewired from the quick connect and purchased a new oil pressure sensor for a 91 pickup (my error, should have been a 89). Anyways same error, needle stays parked in off position.

When i ground the wire to the base of the sensor the needle jumps to full pressure indicating the wiring is good.

Using a multimeter and checking the resistance between the sensor connection and battery negative terminal shows open circuits on both sensor.

This is driving me crazy, any ideas?????