Interesting. I suggested that there might be a difference between the '48-'50 gauges and the '51-'53 set. The reason was that there is an illustration in the 1939-1951 GMC Master Parts Book that shows 'gasoline' rather than 'fuel'. The illustration does, as Dave pointed out, also show the use of 'amperes' rather than 'battery' as used by Chevrolet. Ron's gauge photo may be the correct one for his truck. The illustration also shows that only the oil pressure gauge is mechanical. Dave, does your NOS gauge match that?
My camera battery is quite elderly and not being cooperative at the moment but I'll try and post a photo of the drawing later. Because it's a drawing it is difficult to read and I hope I can get a clear photo for everyone.
