Speedometer / Tachometer

On the BMW 3 Series, vehicle and engine speed is displayed using the following signal path:

• The DME control unit sends the engine speed on the PT-CAN and K-CAN.
• Using a characteristic curve, step pulses for actuating the stepper motor are assigned to the effective engine speed.

The engine speed range is 7500 RPM on vehicles equipped with the NG6 engines.