1996 Ford Windstar Owner's Manual - Page 82

Trip Odometer The trip odometer records the distance of individual trips. Before each trip, set the trip odometer to zero by pushing the reset button. The speedometer, odometer and trip odometer Tachometer (If equipped) The tachometer will show you the engine's speed measured in revolutions per minute (RPM). The tachometer may move slightly when the key is placed in the ACC or ON position, with the engine off. This is normal and does not affect the performance of the tachometer when the engine is running. Some vehicles are equipped with an engine speed (RPM) limiting device that is contained within the Electronic Engine Control Module. The purpose of this device is to maintain peak engine speed (RPM) below a specified limit. (Engine speed limits may vary based on engine size.) 80