System Description: Tachometer
WARNING: This page is about a different car, the 2008 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
The tachometer indicates engine speed in revolutions per minute (rpm).
ECM provides an engine speed signal to unified meter and A/C amp. via CAN communication lines. Unified meter and A/C amp. provides an engine speed signal to combination meter for tachometer via communication lines between unified meter and A/C amp. and combination meter.