Ford class A chassis Owner's Manual page 36

Speedometer
Odometer/Trip Odometer
The Liquid Crystal Display (LCD) odometer is a
combination trip odometer and total odometer.
The total odometer is normally displayed. To see
the trip odometer, press and release the SELECT
BUTTON on the upper right side of the
speedometer. To zero out the trip odometer,
press and release the RESET button on the
upper left side of the speedometer while the trip
odometer is displayed. If the trip odometer is
displayed, press and release the "Select" button
to return the display to the total odometer value.
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