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Magnets on drive shafts
I have installed about 6 of these types on many cars and trucks I have owned, and it is only used as signal generator, not a voltage generator, and would work down to around 30 MPH and up to 80 + MPH normally.
A lot of aftermarket cruse controls came with them as did the old mileage computer.
Most of the time it was only two magnets wired to the shaft.
I read somewhere how to make a set by taking the coil from a 12 volt relay and using it to pick up the magnets when you got a unit with no magnets or pick up and it was left on the car.
Rich
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