You all need to learn about something before posting.
It is NOT illegal to put a lower mileage odometer in a car. It is your car, no one can stop you from doing what you want to it.
But, it is illegal to swap clusters, and then sell the car and state that the mileage is correct. There is your big fines (10k for the first time, I know someone who got caught, jail the second time). If you do sell the car, check the "mileage unknown" box on the back of your title, and you are in the clear.
Now, if you find someone who is changing digital clusters, please let me know.