JDM Speedo to Read MPH not KMH [Archive] - Toyota MR2 Message Board

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Have a JDM Speedo, I want it to read MPH not KMH, all I know is 100kmh is about 60 I was wondering if anyone converted one like this 180mph speedometer for S13 240sx (using JDM speedo) or fine tuning for gear ratio change - zeroyon.com My other options will be custom faces but I wondering if I can just swap in the USDM version and it