Autometer oil press sender question. Need help.
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A 1/8" NPT tap uses a "Q" drill bit. If you can't find a Q bit, I think you can use a 21/64" bit instead.
A 1/4" NPT tap uses a 7/16" drill bit.
If it were me, I'd drill and tap for 1/4" NPT and use the adapter since finding a Q drill bit will be a hassle.



