Oil Pressure Sender Operational Test (Land Cruiser & T100 With Tachometer)

Disconnect oil pressure sender connector. See OIL PRESSURE SENDER LOCATION  table. Using 12-volt source, connect an LED tester between positive battery terminal and oil pressure sender terminal. With engine off, LED should be off. With engine running, LED should flash. LED flashes will vary with engine speed and oil pressure. Replace oil pressure sender if LED does not operate as specified.