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The only way to test it properly would be to remove the cluster and hook the two wires from the speed sensor up to an oscilloscope and view the pattern while driving...preferably with a second person or have the vehicle's wheels lifted off of the ground. You could use an AC voltmeter to view the changing voltage, but it would not show if there was a break in the signal. The speed sensor is essentially an AC voltage generator. It generate approximately 1 volt for every 10 MPH.
 
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