System Description: Tachometer

The tachometer indicates engine speed in revolutions per minute (RPM).

• ECM provides engine speed signal to unified meter and A/C amp. with CAN communication.
• Unified meter and A/C amp. transmits engine speed signal to combination meter with communication line.
• Combination meter indicates the engine speed according to engine speed signal.
  Fig 1: Identifying Tachometer Flow Chart

  Courtesy of NISSAN MOTOR CO., U.S.A.