1. Power on the ATV.
2. Press and hold the "Select/Reset" button on the instrument panel for about 5 seconds. The display will show the current unit of measurement (either "km/h" or "mph").
3. Use the "Up" and "Down" buttons to select the desired unit of measurement ("mph" or "km/h").
4. Press and hold the "Select/Reset" button again for about 5 seconds to save the new setting.
5. Power off the ATV and then power it back on to verify that the odometer is displaying the correct unit of measurement.