Oil pressure gauge reads zero pressure. The oil pan is full. checked wires on oil pressure gauge. ???
First you need to find the sending unit. Some are by the oil filter. Most sending units sink current so by taking the lead off and grounding it you should get a reading on the gauge. This will narrow it down to whether it is the sending unit on the engine or the gauge on the dash. Depending on the car there are a bunch more questions to be asked but this is a general answer.
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