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Pontiacs are know to have bad oil pressure units in them through the years it is a common problem. as for the fuel guage the contacts that read it are probally dirty but this means droping the tank to gain access to the sending unit and new pumps are as high as 400 bucks for a new one oil pressure sending units are a bit cheaper at around 20 bucks but just a hard location to get to.

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Q: What would cause the gas and oil pressure gages to stay pegged all the way over on a 2000 Pontiac bonniville?
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