Thermostat housing thread diameter

[blackout_89t]

Hey...

Does anyone know what size the thread is for the sensor located on the top of the thermostat housing? (see pic below)

I am replacing it with a GM 3/8"npt sensor and I want to see if I can find an adapter before I re-tap the hole.

Thanks.

 

[theDon]

http://www.supramania.com/forums/showthread.php?t=34932