Has anyone changed their speedometers to the CTS-V unit? I found a good price on a whole unit and thought it'd be cool to change mine over because of the TPMS and all the other features they offer. I know i'll have to put tire pressure sensors on my tires for the TPMS to work. But how hard is it to swap the units and how much does the dealer charge to change the miles to what your car actually has before switching units? If this all goes through, this means my nice CTS speedo will be for sale and I know 03'ers will be interested! If any of you guys would be interested after im done send me a pm.