I finally yanked the tach motor. Definitely not the same as the others I tested. Spin starts at lower voltage and it draws 200 mA at 2 volts. The obvious next step is to try a different motor set up for a PS3 tach reader. Do I have some PS3 engines that I would sacrifice to the tach reader motor? Yes. Do either of them have the right size worm gear? No. And from what I've read the gears are not removable. So for now I'm going to put the whole mess on the shelf and work on something more in line with my capability like lighting and scenery.
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