I have somehow turned off my display that shows how many liters per one hundred km in my 2001 audi tt quattro coupe, can anyone please tell me how to turn it back on please I have no manual. Thanks

 

This might be covered in the FAQ..

 

The toggle switch at the end of your wiper stalk

 

There is a button on the BOTTOM side of the winshield washer stalk (not the toggle at the end). If you quickly press the bottom button, it will turn of/off the display. If you hold the button a long time it resets/clears the value that is being displayed (for average values and time).