Depending on the engine coding variant, the instrument cluster can determine the engine speed directly by means of the engine speed signal (td) or receive and display engine speed information from the engine control unit via the CAN bus.
The instrument cluster uses the engine speed signal from the engine control unit (td for petrol engines) to determine the engine speed. Adaptation to match the various types of engines takes place by means of the stored coding data.
As of terminal 15 "ON", the engine speed instrument (rev counter) is controlled by the instrument cluster with the corresponding engine speed signal. The engine speed information is also made available in the form of a telegram to the connected bus systems.