First off, is it the digital or the analog odometer? If its analog, you need to change out the gearing to make it read appropriately. If it is the digital, I think that there is a way to program it to read in the other format.

Or, are you talking about changing the little piece that says "miles" on it?

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-Justin

91 560 SEC AMG - other dogs dd
01 Honda S2000 - dogs dd
07 MB ML320 CDI - dd
16 Lexus IS250 - wifes dd

it's automatic.