First, how did you "fix" the odometer. You need to be prepared to explain how that happened, and your qualifications. Secondly, I would go to your States Attorney General's office and start there. They are there for you and they are free. If you proceed civilly with an attorney your losing $$ the moment you write a check to him without knowing what your outcome may be. Of course you can also call the guy you purchased it from and let him know your going to the AG and your going to pursue the case criminally unless he agrees to buy it back.