And finally, the long awaited answer to the originally posed question: How to make the 2007 Passat display km/h. Quite easily, actually. The electronic odometer can be switched to display km/h by pressing the "0.0" button for zeroing the trip odometer and holding it for about 5 seconds. " 0.0 km/h" will flash, and once the car starts moving, it's a neat electronic speedometer.
Remek
