The Haltech 3/8 NPT coolant temperature sensor uses a large-thread 3/8 NPT 18 TPI fitting and includes a matching Delphi plug and pins. Rated to 127°C (260°F) maximum reading, it provides coolant temp feedback for engine management systems and is intended for installations requiring a large-thread coolant temp sender.
Haltech Coolant Temp Sensor 3/8 NPT 18 TPI (Incl Delphi Plug & Pins)