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how does a non-contact digital tachometer work?
A piece of reflective tape is placed on the shaft(but may not be necessary) The Tach has a light source and a light sensor on the business end of the tach.
Pointing the light/sensor at the rotating shaft the computer inside detects the reflected light. The computer times the period between the reflected light pulses (time per single revolution) and then computes the revolutions in a minute and displays the result on an LCD
Another type of noncontact sensor uses a Hall effect transistor to detect changes in magnetic fields. This type is not as common for a test TACH but would be found on a dedicated tach system. Like a breakerless ignition sensor in a distributor
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