Ok, Thanks. I assumed since I am using a linear pressure sensor that is 5 volts that I needed to have the value at 5 volts; I will set it at 20 volts. I would like to have my dual Spal fans run through the PWM, (I have the Ford version PWM), but be able to have the fan run a little faster when the A/C pressure rises to values near to what a trinary switch does.
This forum has been very enlightening for me, thanks to you and others. Larry
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