Quote:
Originally Posted by markweatherill
I used one of those LED oxygen sensor gauges and a potentiometer to drop the voltage from the 0 - 5V of the MAP sensor down to the 0 - 1V for the gauge. It works very well!
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In another thread I have posted a simple circuit that does this. Yes, it works! <$20. The proviso is that the MAP signal puts out a 0-5V signal.
An alternative is to connect the voltage divider to a cheap digital multimeter (volt meter). I can buy these for <$5.
Use the voltage divider to avoid shorting the MAP signal through the (1M ohm impedance) meter and to scale the signal from 0-5V to the units you want to see.