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Yes. I really do want to use existing signals. They're easy to get to. It's just a matter of calibrating them.
PW at idle seems to be about 400uS.
After some experimenting, VSS = 8400 is close. Haven't gotten to uS/Gal yet.
I'm wrestling with what looks like noise. When the car is stopped with engine off, speed registers about 14-15 mph and mpg keeps ticking slowly. I'm reworking my connections to the car. Alligator clips now.
My MPGuino is on a breadboard and seems to be working correctly.
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