Ford 1996 Crown Victoria Manual page 53

Speedometer
The speedometer tells you how many miles
(kilometers) per hour your vehicle is moving.
Odometer
The odometer tells you the total number of miles
(kilometers) your vehicle has been driven.
Trip Odometer
If you want to track your mileage up to 999.9
miles (kilometers), use the trip odometer. Simply
set the trip odometer to zero by pressing the
reset button firmly when beginning the distance
you wish to measure.
Since the trip odometer displays distance
independent of the odometer it will not always
advance to the next mile (kilometer) at the same
time as the odometer.
Battery Voltage Gauge (If Equipped)
This gauge shows you the battery voltage when
the ignition key is in the ON position.
If the battery is operating under cold weather
conditions, the pointer may indicate in the upper
range of the NORMAL band while the battery is
charging. If you are running electrical accessories
(when the engine is off, or idling at a low
speed), the pointer may move toward the lower
end of the NORMAL band.
If it stays outside the NORMAL band, have your
vehicle's electrical system checked as soon as it
is safely possible.
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