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.
1966 Chevrolet Caprice 2 Door Hardtop (396 Big Block) 1951 GMC 9434 5 Window (waiting on a 292 transplant)
Here's a picture from the parts book. It's difficult to see even in person but look carefully at about 9 0'clock on the Instrument Retainer, part number 7.5100. It says 'gasoline' but even though you really can't see what is printed there, you can see that it doesn't say 'fuel'---there are too many letters.
Ron, I think there must have been two versions of the part, though I don't know which is correct for your truck. If you know for sure the gauge cluster is original then I guess you'll have to see if there is a different version of the repro lettering.
Thanks for all the info everyone. I got the truck from the original owner. Was taken off the road in mid 60's and sat in the barn. I know there was some carry over from different years, and trucks got mixed on the assembly line. I had a 1990 chevy truck that I ordered new from dealer and later noticed it had GMC gauges in it. Ron
I created a thread last year for mixing paint that is close to the GMC mustard/beige color. I spent some time doing this and created spray samples that kept nailing down the color. Try a search for the message I posted. I listed colors and mixing ratios. Maybe this will help you. Tom
Last edited by tom moore; Sun Jun 07 2020 11:17 AM.
Here is a picture showing the rattle can I used. It is a little darker than my original but matches pretty close to the decals. My truck is going to be a daily driver, so it is fine for me, but probably not for the purist.