You don't need to take it to the dealer to have them do it. The procedure isn't in our owners manuals, but it IS in the service manual (which I have). Same thing happened to me when I put my DP ecu in...converts itself to EU settings and they need to be switched back to US settings. Here's the procedure:
Hold the switch in position A ^ (up) while simultaneously turning the key to the on position....release the switch after about 2 seconds
The meny will contain 3 functions
1. Reprogramming the Immobilizer (Repr. Code)
2. Setting the units of measurement (set unit)
3. Moving the exhaust valve for service (set exvl)
While in the service menu, select (Set Unit) and press the selector switch down (position B) for 3 seconds
Each time you push the selector switch down once it will scroll through the sequence of options for measurement, including EU, UK, USA, etc...
Push the selector switch down and hold to select the current flashing option on the screen. The word "mem" should appear indicating the option was stored to memory and the setting will take effect at the next key-on cycle. Turn the key off, then back on and start the bike up if you'd like. You now should be back to US settings