Not real familiar with that gauge, but I think the two small holes are for locating pins to keep the two terminals from touching the housing. The pin on the left in the attached picture is keeping the gauge from seating flat, and possibly letting the terminal short against the mounting housing. If the gauge coil resistances are OK, you probably dodged a bullet. Get it reinstalled correctly so the terminals are isolated from ground. See my notes at the red arrows.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
