Many gauges are actually adjustable if you can get inside them. Either by bending a "U" shaped link in the case of mechanical gauges or a needle adjustment on electric gauges. Usually the better the gauge the better the chance they will will be adjustable.
Of course with electrical gauges you can often add the appropriate resistor to bring them into accuracy. If you have the time, use a potentiometer to find the appropriate value and replace the pot with the resistor when you have it dialed in.
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