Frequently Asked Question

This indicates the electrical connection between the instrument and the sensor is open circuit. This is most likely caused when the wrong wire in connected to the oil pressure sending unit (so that the actual oil pressure input is unconnected). To verify you have a good electrical connection to the instruments oil pressure input, remove this wire from the oil pressure sending unit and touch it to the case of the engine (which should be ground). The oil pressure reading should read 0 psi. If it does, the instrument and the wiring to it is good, and the sensor, or its connection to ground is bad. (Note: It is possible for teflon tape applied to the threads of the oil pressure sending unit to electrically insulate it from ground. Do not use teflon tape to seal the oil pressure sending unit.

If the reading does not go to zero when the oil pressure wire is shorted to ground, use a continuity tester or ohm meter to verify a good electrical connection from the connector that plugs into the instrument to the end of the wire where it attaches to the oil pressure sending unit. It is very rare for the instrument to have a failure such that it does not read oil pressure correctly.