This is the information that I recieved when asking about changing my clock to a 24 hour clock. If you look for the title of 24 hour clock you can see all of the posts.
It's the instrument controller soft coding. I've used this to disable the seatbelt chime. Choose the market version (EU or UK) that uses 24-hr clock, but if your cluster has temperature display, it would change it to centigrade. From ross-tech:
Instruments Recode - 07
Write down the existing coding for future reference.
Enter 5-digit code from below
Look at the first two digits in the coding. Add the values for the options together to get the correct coding.
00 - No available equipment
+01 - Brakepad wear sensor warning active
+02 - Seatbelt warning active
+04 - Washer fluid level warning active
Look at the third digit in the coding (Market version):
1 - "EU" 24 hour clock (may result in odometer in km in 2002+ clusters)
2 - "USA" 12 hour clock
3 - "Canada" 12 hour clock (may result in odometer in km in 2002+ clusters)
"The third digit in the code is the country code. The codes are:
4 - "UK" 24 hour clock (should result in odometer in miles)
5 - Japan
6 - Saudi Arabia
7 - Australia
Look at the fourth digit in the coding (Cylinders):
3 - No Service Interval (2002+ models)
4 - 4-cylinder (1999-2001 models)
6 - 6-cylinder (1999-2001 models)
Look at the fifth digit in the coding (Distance impulse multiplier):
2 - 3538
4 - 3648 (some 2002+ models)
So, if you want to have Seatbelt warning and washer fluid warning only in a 2001 Canadian 6-cylinder vehicle, (add 00+02+04 = 06),3,6,2 = 06362.
Edit: registered VAG-COM only. VWTool 2.0.9 which has been out in the open can also do it.