Quote:
Originally Posted by Mikey
I checked the tach gauge vs the readout on the HVAC control. Hold up and down fan speed buttons simultaneously until 00 appears then tap up until 06. Tap the fan button. This gives you rpm/25. It won't read all the way to 7000 but I was able to verify my tach gauge reads about 15% high throughout the entire range. So 8000 is really only about 7000. Will have to get it calibrated.
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BATEE can either do the work for you, OR they can sell you the resistor circuit board replacing the old one, OR you can build you own
precision voltage divider and install it yourself. (Personally, I built my own voltage divider, but that was before
BATEE was known to me, and the fact they now sell the "chip" for DIY'ers like me!)