Ford F series Owner's Manual page 23

"Headlamps On" Alert Chime
This chime will sound if you open the door
while the headlamps or parklamps are on.
Fuel Gauge
The fuel gauge displays approximately how
much fuel is in the fuel tank only when the
ignition switch is ON.
The fuel gauge indicator may vary slightly when
the vehicle is in motion.
With ignition switch OFF, the fuel gauge
indicator may drift from the ignition switch ON
position.
Fuel gauge
Engine Coolant Temperature Gauge
This gauge tells you the temperature of the
engine coolant, not the coolant level. If the
coolant is not at its proper level or mixture, the
gauge indicator will not be accurate.
The pointer moves from the C (cold) mark into
the Normal band as the engine coolant warms
up. It is acceptable for the pointer to fluctuate
within the Normal band under normal driving
conditions. Under certain driving conditions,
such as heavy stop and go traffic or driving up
hills in hot weather, the pointer may move to
the top of the Normal band.
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