Mileage officially can only be changed once on new cluster that has less than 100km on it. If you want it changed later you need to desolder EEPROM, read it in reader, modify data, write it back in the chip and solder it back. On some clusters it can be changed with aftermarket gear like VAGTacho or VAG Commander. If you are swapping clusters it's probably easier to swap eeprom chip from the old cluster into the new one.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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