Guage cluster question

Help Please! My '89 Crown Vic has a temp/volt/oil pressure cluster mounted on trim panel above/right of glove box. It's an ex-fire chief car and I suspect an aftermarket
install(?). Oil guage starts to peg up and down shortly after starting enging wildly. Is this an easy fix or normal operation? Thanks in advance! Bob Manly/Orlando
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Its after market and the problem is probably the oil sender...
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