Your problem could be that your using a magnetic sensor so its holding on due to the magnetic fields. If you use a normal hall type that just detects metal within 3mm like mine it should be ok. You can then vary the mark to space ratio with the size of the metal pieces.
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Now, Cole, when you shift the gear and that little needle on the ammeter goes into the red and reads 2000 Amps, that's bad.
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