The oil pressure sender looks to be grounded at the sensor. It's in a crappy location by the distributor.
Fuel pump is grounded at G404, which is somewhere near the tail lights, but I'd think that you would have other issues if it was not grounded.
Here are the diagnostics for the oil pressure gauge. Looks like you'd need a signal generator...not sure on that one.
I'd try a different cluster.
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