Use the Tacho Pro 2008 OBD II- plug:
The diagnostic port is in the back of the car in the ashtray.
There are different instrument version. To find the right one, you have to try which one gives you the right value when reading. Reading will not corrupt the database. But only program with the version that gives you the correct value!
1. Turn ignition on.
2. Connect the Tacho Universal to the OBD II plug and the diagnostic port.
3. Select thr menu Audi-A4-VDO old- Diagnosis
or Audi-A4-VDO old MFA-Diagnosis
or Audi-A4-VDO new-Diagnosis
4. The Tacho Universal shows you with one of these programs the old value.
5. Enter the new value.
6. Verify the new value with ok.