internetz
1. push and hold the button to reset the milage longer than 5 sec.
2. release and push resetbutton as often as the display reads 19
3. it will show LogOff LogOn (changing between those two every second)
4. when it shows LogOFF (yes -OFF) push the reset-button
5. now push the reset-button until the display reads 7.0
6. release, and push once again - display reads 7.1, push two times more to get to 7.3 -> et voila -> digital speedo