The Stovebolt Site Forums The Shop Area Engine Shop Temperature and oil gauges

My 46 1/2 ton has a 57 235 in her. I understand that the temp and oil gauges in the dash may not work for this hotter/higher pressure engine? I notice they have dash cluster glass with different values for oil and temperature but what do I do about the gauges themselves?

I'm not sure I understand your question. I have a '49 half ton with a '59 235 engine. I chose to use the original temperature and oil pressure gauges. They work just fine. The oil pressure gauge runs "pegged" all the time at 30 psi, but this doesn't seem to hurt anything. I don't know exactly what pressure it's running at, but I do know it's always north of 30 psi.

Ditto!

Basically I can buy a new piece of glass for my gauges with numbers up to 60 Psi. Do I then need a gauge with the upper range higher than 60?

I would think so. I run mine pegged all the time.

They can be re calibrated some how, but changing the face won't do it.

A shop would probably charge you $25 dollars to calibrate so run it like Joe suggest. For me I lucked out and dropped by the guage resto shop close by and he calibrated mine for me..... he was not "in the back" less than 5 minutes total and brought it back. I suppose its simply if you have the equipment!!

EDIT: I did this on my 37 but kept the "original" guages for looks. This means when my guage says 15 or 30 lbs the oil pressure is actually double that at 30/60.
On my panel I had it calibrated and used the 60 lb decal on the face of my guage.

Find a 46 GMC gauge panel, came with a 60 psi gauge from the factory. Or you can run the stock gauge and add a small higher pressure gauge on the engine if you want.