Tachometer (Escape, Mariner)
WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
The tachometer is electrically operated and indicates the engine speed in revolutions per minute (RPM). The tachometer range is 0 to 8,000 RPM. The tachometer receives the signal over the communication network from the PCM. If the RPM information sent to the instrument cluster is invalid or missing, the instrument cluster defaults the tachometer to 0 RPM.