Steve,

TO prevent galling, a dab of fuel lube should be put on the threads. A lock washer is also recommended to account for potential vibration.

Scott
7A Finishing
 
Lock washer only

A check of EI's installation manual says...

http://www.buy-ei.com/Manuals/EI MVP-50P II.pdf

Remove the threaded plug located in the carburetor housing just below the throttle valve. Install the Carburetor Temperature Probe (P-128) in this hole using a lock washer. Care should be taken not to over-tighten the probe, thereby stripping the threads in the carburetor housing.

Apparently it's a straight 1/4-28 thread....

P-128 Carb Temp / OAT Probe, 1/4" -28, Type K. Used on most engines.

gil A
 
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