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Old 09-20-2013, 06:59 AM   #5 (permalink)
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A Saturn SL2 has a MAP sensor. Perhaps a voltmeter reading the output from that is an alternative to a mechanical gauge?

At its simplest, just read the 0-5V across the signal and earth. If you want to make it more sophisticated, use a voltage divider (resistor) circuit and a 200mV LCD screen to convert the reading into units meaningful to you.
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