OK, you asked for it. The odometer needs to be adjusted downward by the Yellowbox when 220 MPH faceplates are used. Look at your 186 gauge where 100 mph is at 12 'oclock. After installing the 220 speedo faceplate, 12 o'clock reads approximately 115 MPH. Without a Yellowbox adjustment, the speedo would read 115 MPH when in fact you're doing 100. In order for the new speedo to be accurate, the needle needs to be at appoximately 11 o'clock, the 100 mph position on the new speedo. But that's about 80 MPH as currently calibrated. The bike needs to be told that it's not covering it's currently calibrated distance, but something about 20% less, 80 miles. That puts the needle at the 11 o'clock position, 100 MPH on your new 220 speedo. So when you sell your bike that reads 24000 miles, it really has 30000 miles on it.