Old large 3.5 inch wood boat temperature gauge.
I believe this originally was front mount with the big wide extra bezel.
Someone had it rear mounted in a old boat panel. The housing does not have ears it has studs for on the back for the brackets. They had some big like 5/16 nuts in there the way they had it mounted there’s a lip on this housing That the nuts will catch on to hold it better than just a little flimsy basil.
I just clean the glass and basil off with soap and water, wiped off the face of the gauge.
The ring for the glass has rust but I think it will clean up and be usable.
Recharge as is our do a full restoration