Specifications: Tachopro (obd2 iso9141 interface + tachopro dongle integrated) This compact interface will allow you to easily read/write/modify the mileage/km on your car without the need to remove the dash. It connects to the on-board diagnostics port located in your car. This kit will also allow you to use it as a diagnostic iso9141 compatible interface. (see obd2 diagnostic cable specification for details) This tool is used daily by engineers all over the world and is very effective. The software is DOS based and in german, but very easy to use. A laptop or PC is required, note that on very fast ones over 233 MHz the software might not work. Specification: - interface is based on certified iso9141 bus transceivers and rs232 level shifters - k-line & l-line (k/L interface) - bi-colour status led`s for k-line & l-line - power LED - powered from car battery over service cable - service cables for BMW, mercedes benz and volkswagen included - comfortable service cable length of 2,00 metres Other information: 1. The tachopro software might not work on pc`s that are faster than 233 MHz 2. Interface electronic of the tachopro & k/L is the same, only tachopro have the dongle inside so the tachopro software is possible to run and manipulate the mileage 3. Make sure using the tachopro software under plain DOS only not under windows or a windows command shell 4. Scantool, scanmaster, digimoto are using another interface based on elm interpreter chips and are not compatible to this interface (of this elm interpreter chips exist 3 pieces with different protocols) 5. For further dashboard problem, check pls. From what manufacturer your combi instrument is made, vdo(siemens), motometer or magneti. The tachopro can only work for polo on the one made from motometer 6. Tachopro supports cars up to 1999 sometimes to 2001 (from model to model) 7. It can make the full eeprom backup of the techopro, only the eeprom from the I