Ford Grand Marquis Owner's Manual page 34

The speedometer
Odometer
The odometer tells you the total number of miles
or kilometers your vehicle has been driven. If
the cluster is replaced, and the accumulated
mileage on the odometer is unknown, the
replacement cluster will have the circled "S"
illuminated with zero miles on the odometer. If
the actual vehicle mileage can be verified, then
an authorized service center can program the
actual mileage into the odometer of the
replacement cluster. The actual mileage (if
known) or an estimated mileage (if unknown) is
shown on a label affixed on the door pillar.
Press the E/M (English/Metric) button located
just below the message center display to show
miles or kilometers.
If the odometer displays the word "ERROR"
contact your dealer for service.
The Electronic Message Center
Along with information the warning lights and
gauges provide, the electronic message center
lets you:
see problems such as Door Ajar, Air
Suspension, Trunk Ajar, Washer Fluid
see how many miles/kilometers you can
drive with the fuel remaining in your tank
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