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I have looked up and down through the FSM and cannot find what the expected voltages are for the factory oem pressure sensor. I just want to check the presssure with a multimeter.
I have no idea whether it is linear, but with two known points on the scale on the gauge, you should be able to determine the relationship between voltage and pressure with a battery, variable resistor, and voltmeter. You may need a small light bulb or similar load to get the test apparatus to work properly. You can get that sort of stuff at Radio Shack.