When you turn on the car and it is cold outside, the temp reads 80? Well I have seen the wire harness fail in the alternator circuit, that will take out the oil pressure gauge, but the temp gauge could be its own problem......Be sure to check the fuses! They will have hairline cracks in them at times.

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Benzmac:
Donnie Drummonds
300E
ASE CERTIFIED MASTER AUTO TECHNICIAN
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