Tachometer

The tachometer display is controlled by a measuring mechanism actuated by a stepper motor driver. The input signal is provided by the Engine Control Module (ECM). A tachometer pulse factor is stored the Electronically Erasable Programmable Read Only Memory (EEPROM) for conversion or the input frequency into revolutions:
^ Range: 1.50-655.35 pulse/revolution
^ Resolution: 0.01 pulse/revolutions

At a tachometer pulse factor less than 1.50 pulse/revolution, the instrument behaves as though the EEPROM was not programmed. The maximum display angle is 115.5 degrees of pointer sweep and has a display tolerance for accuracy of 2.4 degrees.