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Overdrive (O/D) indicator

Fig 1: Identifying Overdrive (O/D) Indicator - Instrument Cluster

Courtesy of FORD MOTOR CO.

The O/D indicator is located in the instrument cluster and is colored green.
The O/D indicator is actuated by the O/D switch on the selector lever. It tells the driver that shifting into 4th gear is prevented by the transaxle control.