I can't find the link to the '03 manual.
To change from kph to mph: Disconnect the battery then hold down either of the buttons while reconnecting the battery.
The top button is the reset button.
The bottom is the mode button.
The initial display is the clock. If you press the mode button it goes:
Speedo, Speed, Total Distance, Trip Distance.
To change the time:
-Press mode until time is shown.
-Press and hold mode and then adjust hour with top button.
-Press mode again and adjust minutes.
-Press mode again and time is set.
To zero trip distance:
From time display press mode 3 times and hold to zero trip.