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I recently bought a used digital speedometer on ebay,Is there a way to bench test this item to see if it works? What wire would I run to a battery and what response should I get from the gauge?Thankyou
Connect yellow and red wires to 12 volt positive and black to ground and gauge should power up. If apply light air pressure(no more than 10-20 psi) then should see a speed reading.
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