FORD 2003 Expedition v.1 - Manual (Page 16)

This gauge indicates the temperature of the engine coolant, not the
coolant level. If the coolant is not at its proper level the gauge indication
will not be accurate. If the gauge enters the red section, the oil
pressure/engine coolant and Check Engine/Service Engine Soon
indicators illuminate, refer to What you should know about fail-safe
cooling in the Maintenance and specifications chapter.
Engine oil pressure gauge
Indicates engine oil pressure. At
normal operating temperature, the
needle will be in the normal range
(the area between the “L” and “H”);
if the needle goes below the normal
range, stop the vehicle as soon as
safely possible and switch off the
engine immediately. Check the oil
level. Add oil if needed (refer to
Engine oil in the Maintenance
and specifications chapter). If the
oil level is correct, have your vehicle checked at your dealership or by a
qualified technician.
Battery voltage gauge
Indicates battery voltage. If the
pointer moves and stays outside the
normal operating range, have the
vehicle’s electrical system checked
as soon as possible.
Instrument Cluster
16