I am right in the gauge selection/aquisition process for my West Coast, so this is timely for me.
Some gauge manufacturers offer a gear reduction/increase kit for the sender portion. Check with your gauge maker to see what they have...maybe they have a table/chart to help you sort out which one you need...otherwise, you have only the option of going with an alternate electrical programmable speedo, or living with what you have, learning the true vs indicated speed
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