Tachometer, Trionic T7: Notes

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

The Trionic T7 continuously sends engine speed information, unit rpm, out on the bus.

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

Fig 1: Identifying Tachometer, Trionic T7

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Identifying Main Instrument Unit's Control Module

Courtesy of SAAB-SCANIA OF AMERICA, INC.