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The user interface of VAG Tacho is notably retro, favoring utility over modern aesthetics. To use it, the cable is connected to the car's OBD2 port and the computer. Once the user selects the correct ECU or dashboard type from the menu, the software establishes a connection. From there, users can "Read PIN," "Read EEPROM," or "Write New Mileage." Because the software writes directly to the vehicle's memory, it carries a level of risk; a corrupted EEPROM write can "brick" an instrument cluster, making it unusable.

The primary function of VAG Tacho is to provide access to the EEPROM memory of the instrument cluster. This allows users to perform tasks that are usually restricted by dealership-level equipment. One of its most common uses is retrieving the 4-digit or 5-digit Login Code (PIN) required for programming new keys to the immobilizer system. Without this code, adding a spare key to an older VW or Audi can be a costly and complicated process involving a trip to the dealer.