AN 05 2500 HD 6.0! CAN I RUN THE (CANNED TUNE) AND CHANGE SPEEDOMETER OR DO I HAVE TO USE THE FACTORY TUNE??? WILL IT CHANGE ODOMETER TOO???WHAT CLEARS ENGINE HOURS??? FOR GM PROTOCALL WHAT ELSE DOES IT CLEAR???CAN I COPY THE PERFORMANCE SETTINGS FROM THE PERFORMANCE TUNE TO THE FACTORY TUNE THEN ...