You do know that is a federal offense right? Just letting you know. Don't be too surprised if you run into trouble the next time you get a state inspection. Or if you sell it and the buyer gets a Carfax. At either of those times the true mileage will be shown and you will be held legally responsible because it happened in your possession. And the Carfax and state records will show that as well.
Its called Odometer Fraud.
Even if you were to tell a seller that the odometer is off, you could not provide accurate mileage of the vehicle. Which still poses a problem.
This is the federal law on odometer tampering: Resetting, disconnecting or altering a vehicle's odometer to conceal the true mileage is known as odometer tampering. No person shall adjust, alter, change, tamper with, advance, set back, disconnect or fail to connect an odometer of a motor vehicle, or cause any of these to occur with the intent to alter the number of miles registered on the odometer. It is illegal for anyone to engage in odometer tampering or sell a vehicle knowing the odometer has been altered.
Odometer tampering comes with up to 5 years in prison and up to a $5000 fine.
I'm just telling you this so you know. It does not matter to me one way or the other I'm just informing you of what can happen so if it does happen it won't sneak up on you.