The module is a device used instead of analog and digital tachographs in the vehicle. In some countries the tachograph is not mandatory, but the systems connected to the tachograph in the vehicle depend on the signals produced by the tachograph. Therefore, the vehicle must be fitted with a tachograph for proper operation. TCM can be installed instead of tachograph device without any wiring work. It is easy to install and does not cause any malfunction afterward.