CMP GM Dash Oil Pressure thread size?
Does anybody know the thread size for an early GM commercial style dash oil pressure gauge? It doesn't appear to be pipe thread as used on Chev fuel pumps (just a bit smaller) and almost looks like it would take a compression fitting but won't. If it is a compression fitting it might just be my threads are a little damaged and I could retap...but only if that's what it is.
Any ideas?
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