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Power Strokes
7.3 Aftermarket
Aeroforce Scan Gauge
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[QUOTE="Lethalthreat7.3, post: 693355, member: 10651"] PCM's operate from their inputs on 0 to 5vdc. This is done so that while starting and the alternator is recovering the loss from starting( dropping from say 13v to say 11.5v ) it doesn't cause any input issues to the PCM. The way I understand it is to wire your reg to a "switched 12vdc" and install the resistor inline to the gauge. The regulator should vary the output to the gauge from the 0.5vdc to 4.5vdc with the sensor inline to prevent a 12vdc feedback if you disconnect from the OBDII port. [/QUOTE]
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