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Oil pressure loss


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Oil pressure gauge stays at 80 when running now today it ran just fine going to work. now when truck hits 2000rpm the gauge drops to 0 and then goes back up to 80 when the rpms drop. Truck has just under 100,000 miles and running royal purple oil any ideas on whats going on?

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Could be the oil gauge stepper motor or the oil pressure sensor.

But you can pull the oil pressure sensor and hook up a hose and mechanical gauge to confirm what the oil pressure actually is.
The stepper motor and the sensor, along with the sensor connector are known to fail with similar symptoms.

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