Ford Windstar Owner's Manual page 33

Instrumentation
limiter is to maintain vehicle speed below a specified limit to
ensure safe vehicle operation.
The speedometer and odometer
Odometer
The odometer displays the total number of miles or kilometers
your vehicle has been driven. Press the fuel computer E/M
(English/Metric) button to switch between miles and kilometers.
If the electronic cluster is replaced and the mileage on the old
odometer is unknown, the replacement cluster will be set to
zero miles (kilometers), and the circle "S" symbol to the left of
the odometer will be lit to indicate that a service cluster has
been installed. A label showing the estimated mileage will then
be attached to the door pillar. If the actual mileage can be
verified, an authorized service center can program the correct
mileage into the replacement cluster, and the circled "S" will
not be lit.
If the odometer displays the word "Error," have your vehicle
serviced.
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