[77newell]

The engine compressor does the same job as the electrical compressor though the turn on and shut off pressures are 20-30 psi high r than for the electric compressor. The gauge of most interest here is the "supply" gauge on the dash, watching it for both the electric and separately with the engine compressor. I don't have a pressure gauge at my electric compressor so I'll have to think about how to use it depending on the results of this test.

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Also useful to now, what pressure is the gauge near the electric compressor indicating when it turns on and turns off. Does the dash gauge show the same?