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What would cause oil pressure gauge to stay pegged all the way over after installing a new oil pressure switch


I would recommend that you re-check the application for that new switch
(light only, light + gauge, gauge only) Whatever is causing it, it is a
short to ground in the circuit to the sender when the gauge goes to the top
of the range immediately upon KOEO (key on engine off).

Jim O'Neill
Chino Autotech Inc.

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