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1. 

   Joined: May 14, 2023
   Posts: 1

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   53Mercuryvert

   If speedometer is indicating faster than actual speed, do you go up or down with tooth count

    

   53Mercuryvert, May 9, 2025

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2. 

   Joined: Sep 4, 2009
   Posts: 3,419

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   FrozenMerc

   Member

   from Springfield

   You need to slow the cable RPM down, so up in tooth count.

    

   FrozenMerc, May 9, 2025

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   38Chevy454 and jaracer like this.
3. 

   Joined: Apr 17, 2005
   Posts: 1,242

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   Relic Stew

   Member

   from Wisconsin

   Standard speedometers are designed to display 60 mph at 1000 rpm. Calculate driveshaft rpm from gear ratio and tire cir***ference, then you'll have the ratio you need in the speedometer drive gears.

    

   Relic Stew, May 9, 2025

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