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Received a Bosch gauge today from Prime, temp hooked it up and pressure at idle was 65psi!! At higher rpm 100psi was observed. Kept the machine running for .5 hr to be certain oil at working temperature an still good pressure.

My first step will be to purchase and hook up a gauge to verify the pressure. If low then I'll tackle the cam plug, otherwise it's just a matter of mounting the gauge. Thanks for both responses - very helpful - and I'll post how this turns out.

The machine has about 1,200 hrs and just recently the low oil pressure indicator intermittently lights up at low RPM and idle. The engine has plenty of oil. Sometimes the light never turns on after startup and then other times it turns on even at 1000 rpm. Thinking it's not the oil pump but...