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Start with page 2-120 or the PDF page 206 from TM 9-2320-361-20. It goes through the truobleshooting of all the instruments there. You should have has 28 volts or battery voltage at wire 28 where it is disconnnected from the sending unit. If you don't have 28V there the gauge or wire is screwed...

In theory you are right. Try pulling that oil pressure gauge out and get it to work. The oil pressure gauge housing needs to be grounded as well. I went through several gauges and sending units on my wrecker before I woke up to that one.

Here's the info you need to do a complete and thorough check of the fuel guage and components. This is right from the TMs available for free at Steel Soldiers.