Jim,
The fuel/amp gauge are electrical and the oil pressure/temp gauge are mechanical (temp gauge has the bulb which is the same as Chev). I read somewhere that the 1947-49 GMC had the electric temp gauge, just can’t find it right now.

Dave


1966 Chevrolet Caprice 2 Door Hardtop (396 Big Block)
1951 GMC 9434 5 Window (waiting on a 292 transplant)