-3/8-18 NPTF-, all V8, Chevrolet small block, with factory gauges & aftermarket or 1981-up cylinder... see more-3/8-18 NPTF-, all V8, Chevrolet small block, with factory gauges & aftermarket or 1981-up cylinder heads which have a smaller sending unit hole (correct resistance and connection, produces accurate gauge display)
all Note: Wires to be soldered onto switch and connect to the Engine Harness.all Note: Wires to be soldered onto switch and connect to the Engine Harness.