Same size as the spark plug threads. I believe its 14mm. most compression gauges will have threads for both size spark plug holes. The gauge is a cheap tool, and everyone who works on his car should have one in his toolbox.
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Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing.
TEMS, and some nice MODS. Sold to a friend 10/08/08.
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