The engine RPM has little to do with MPH(KPH) the only thing that you need to know is what Diff ratio you are running that is if your speedo drive is taken at the output shaft of the Transfere Case as on a XJ where the Std Diff ratio is 3.55-1 But you must remember that the speedo gears do not step up in one tooth at a time graduations therefor you may not be able get 100% accuracy unless you go electronic
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Fred
Dont take life seriously Nobody gets out alive
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