Reply to "Oil pressure"

The pressure should run higher when the motor is cold, and a bit lower as the motor warms up. 30 psi (210 kpa) is about normal at idle when warm.

If the gage is reading higher when warm, and the reading is accurate, then the relief valve built into the oil pump is sticking closed when hot.

If the reading is bogus (most likely) then something is creating a short circuit, as increased resistance, a bad connection or wire, would create a lower reading. The things to check for are: oily or greasy pressure sender; the wire connected to the pressure sender possibly grounding out on the case of the pressure sender; a wire connected to the back of the gage shorting out.

Your friend on the DTBB