Technical description: Tachometer: Notes

The main instrument unit has an electronic tachometer which is supplied with current and controlled by the main instrument unit's control module.

Trionic T7 sends continuous information on the engine speed to the bus, unit RPM.

At engine speeds below 1100 RPM (idle speed range), the display is damped to give a steadier reading.

Fig 1: Identifying P-Bus Messaging - Tachometer

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Identifying Circuit Diagram - P-Bus Messaging - Tachometer

Courtesy of SAAB-SCANIA OF AMERICA, INC.