Either the guage or the wire going to it, or no oil...lol. You could have someone sit in the car with the key on and short the wire for a few seconds against the block and see if the guage moves any, if not then it could be the wire but more than likely it is the guage. You could get a mechanical guage and try it out to make sure there is pressure at that source too.
Mine have always worked, but not equally. I don't think there is a fuse for the guage itself. You might have to take the instrument cluster out and make sure there is nothing wrong with the contacts for the guage or get out the manual and look at the wiring diagram.
As far as the leaking valve covers, that will not cause the guage to stop working unless you run out of oil!
Russ
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