My 1999 ISC engine (47,xxx miles) jumps to 80 psi at startup, warm day or cold day. As the engine warms up pressure drops until the engine is at normal temperature, then idle pressure is about 35 psi and at 1,800 RPM pressure is stays about 60-65 psi.
I would not be concerned about what the gauge says as long at it shows above 30 psi at idle when hot/ normal operating temperature.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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