http://www.instructables.com/id/Tachometer-made-from-a-bicycle-speedometer-cycloc/
You just need a cheap $15 - $20 bicycle speedometer and set the wheel size to be 268 mm or 27 cm. The magnet is attached to the wheel or shaft you a
re measuring. Its diameter doesn't matter. Then the mph reading times 100 is the rpm. For example, 28.1 mph = 2,810 rpms
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