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The tach is easiest. just know what engine, and someone can tell you approx where it idles.
speedo... you can calibrate with a GPS and cruise control.
Gas, it might take a few fills to get REALLY accurate readings.
and temp, get your car to its normal idle heat (usually 1/2 on mine) and set your needle there.
Its not THAT hard.
Also... if the needles move backwards, or really slow... you have the motors mixed up. They seem interchangeable, but they aren't.
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