Engine Coolant Temperature Gauge
WARNING: This page is about a different car, the 2004 Ford RV Cutaway, 2004 Ford Econoline, 2004 Ford E450 Super Duty, and 2004 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
The instrument cluster receives information on the engine coolant temperature from the PCM via the SCP network. When the engine coolant temperature is within normal operating range, the gauge needle will be in the normal range (between "H" and "C").