To verify the oil pressure switch, connect an ohmmeter between the oil pressure switch and ground to determine continuity with the engine off and on. Start by removing the single wire harness connector of the switch. Switch on the ignition switch; the lamp indicating the presence of oil pressure must be off, and it is not, then look at the wire harness and see whether it has shorted to ground. Attach the ohmmeter to the pressure switch and ground, when the engine is off the ohmmeter must show continuity, and when the engine is running, must show no continuity. In case the readings are not indicated as planned, carry out an engine oil pressure check, and in case the oil pressure is normal, change the switch. Removal and installation To be removed and installed, place oil pressure switch or filter close to the oil filter. Disassemble the connector with the wire harness by unscrewing it counterclockwise, and wipe off the switch by wiping the connector. Installation This is a 3 thread installation where the thread three up, and the head of the switch sealed with sealant of the third thread then tightened to 8.7-13 ft. lbs. (12-17Nm).