Engine Coolant Temperature Gauge: Tachometer
WARNING: This page is about a different car, the 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. 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 6,000 RPM (gasoline vehicles) or 0 to 5,000 RPM (diesel engines). The tachometer receives the signal through 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.