(a) Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 3.
(b) Connect the positive (+) lead from the voltmeter to terminal 2 and the negative (-) lead to the battery negative (-) terminal.
(c) Check that the voltmeter indicate approx. 5 volts four times per each revolution of the shaft.
If operation is not as specified, replace the speed sensor.
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