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Old 05-18-2007, 03:27 PM   #11
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Join Date: Dec 2005
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Quote:
Originally Posted by Bill in Houston View Post
Personally, I'd be searching junkyards for an old timey mechanical tach, and then figuring out where to hook it to the motor...
One thing I was thinking: just attach a tiny dc motor (or a magnet and coil pickup) to the drive motor's end shaft and calibrate its voltage to the motor RPM (which we can back-calculate based on vehicle speed, knowing the transmission ratios). Then make up an analog volt gauge that ties it all together....
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