When was oil AND filter changed last and make sure you use 10W30 on an older car. Sending unit might be bad. You can remove it and screw a gauge in there to check it. don-ohio
Replace oil pressure sender switch
change oil filter
then if no better
fit a sandwich plate oil pressure reader between oil filter and block
to get the engine oil pressure when running
Maybe not a pump
check the sump oil level
have the low oil level sensor checked for operation
have the oil pressure checked using a mechanical oil pressure gauge
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