Quote:
Originally Posted by vince_aust
The sensor is an imbEdded reed switch with high power magnet.
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The sensor is a magnet and a coil of wire arranged so that the flux through the coil changes as a gear tooth or a pin is placed near the end of it. The change in flux generates a voltage, rising and falling as the gear tooth completes and breaks the flux path.
You can see an output for the speed sensor with a good multimeter set to AC because it happens 129 (# teeth??) times per revolution but the reference only occurs once.