If you put the original cluster back in CP will go- it is the ckuster that goes into CP, not the rest of the car.
The dealer *can* correct milage after 100 miles and dont always want a receipt. My cluster went wrong and I got the dealer to sort the CP and milage and was never asked for a receipt. I had already fitted it, but they wanted to refit the original to get the coding, then replace with the "new" one (second hand from ebay). The cluster I bought had 120k miles on it, and when I got it back from the dealer it was showing the correct 148k
I was charged 1.5hours for the work, and they normally charge half an hour for CP removal alone (£70 ish from memory)
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2004 A8 3.0 TDI Sport Brilliant Black - now gone
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