Ford Windstar Owner's Manual page 27

Electronic Cluster (If equipped)
The Electronic Cluster works only when your ignition is in the
ON position. Each time you start your vehicle, the displays go
through a self-test by lighting up all segments for about one
second and then turning off all segments for about one second,
before displaying actual gauge readings. (The turn signal and
high beam indicators do not light during the self-test. The LOW
OIL light may remain on throughout the self-test and for several
seconds after normal readings are displayed.) This self-test
demonstrates that all of the display segments are working
properly.
The electronic cluster has three major functions to provide you
with information about your vehicle's operating status:
Warning and Indicator Lights
Electronic Gauges
The Fuel Computer
The electronic cluster uses the same warning and indicator
lights as the mechanical cluster. However, the electronic cluster
contains some additional warning and indicator lights as
described here.
Oil Pressure Light
The oil pressure light
Instrumentation
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