Thanks for the help and information. Didn't take a live pic of the dash because it's not completed yet but this book pic does label everything, if you can read it LOL. Every one of these WW2 vehicles I restore is a learning experience.
These gauges appear to be 6V. The vehicle is 12V. I just now rigged up a little test stand with a variable pressure regulator hooked to a 1/8" pipe fitting that I can screw the sender into. The test stand is bonded to the dash with a good wire with crimped on eyes so the wires are bolted to the components for good connections.
The gauge DOES go to zero when the sender is connected to the gauge. When I slowly put air pressure to the sender the gauge did come up but was jumping quite a bit. Went up to 20 psi, then jumped way up to 250 so the particular sender I was using must be a little sticky inside. Maybe running oil pressure to it will smooth it out, then again maybe not.
Tomorrow I'm going to test out the rest of the pressure gauges and senders along with the temp senders. I'm going to have to scour the other two donor vehicles he has to try to find enough senders. When these old vehicles went into private hands the electric gauges go away and are replaced with manual gauges or are just plain removed and replaced with a pipe plug. All senders of one particular model are the same so they will fit the engine or whatever else. Don't know about variability among the year ranges but the military did try to keep everything standard within a certain vehicle. Jim
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