Thermostat Housing Plug and Coolant Temp Sensor Thread Pitch: Complete Size Reference
Which thread pitch does your thermostat housing plug or coolant temp sensor use? M12x1.5, 1/8 NPT, and more — a quick reference by make and platform.
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Thermostat Housing Plug and Coolant Temp Sensor Thread Pitch Explained
Coolant temp sensors on most modern engines use M12 x 1.5 metric thread, not NPT. Thermostat housing plugs are usually 1/8-27 NPT. Here’s how to identify which you have and why they’re not interchangeable.