I engaged in the absurdity of rolling mine *backwards* down to 82,000kms to match my old one.
Ridiculous? You bet. It took a long time.
I did the minimum diligence of photographing both clusters on the day of install along with a current newspaper. All photoshoppable of course, but jiggering the metadata and all that would speak to a pretty advanced level of deception. I would like to think that my immaculate maintenance record keeping and receipts would speak to my honesty and character with any future buyer.
Plus, in this case I clearly have nothing to gain for future value by rolling it up so high.
IMO if you take the trouble to get your photos notarized, at least you are going that one extra step to show you took the time to make everything legit, despite the fact that the photos are still easily altered.
As documented elsewhere, you can roll it with a small DC motor from any surplus store, a chunk of lumber, a couple of hose clamps, and a small square screwdriver bit. A variable DC power supply helps, or else you are going to slam your gauge at 220kph or more.
have fun