Thank you for asking your question on JustAnswer.
The other Experts and I are working on your answer.
By the way, it would help us to know:
-Do all the other gauges work properly?
-What else have you already tried?
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The most common cause of the problem you are having is a defective Instrument Cluster. However, before replacing any parts, I always recommend proper testing first. If you need, I can send the test procedures as well as the replacement instructions, directly from Ford.
The Speedometer/Odometer Is Inoperative
Vehicle speed information is sent to the instrument cluster by the powertrain control module (PCM) over the high speed controller area network (HS-CAN) communication bus. The PCM calculates vehicle speed from the transmission output shaft speed (OSS) sensor input and from the tire size and axle ratio configuration in the vehicle identification (VID) block of the PCM.
The instrument cluster receives an odometer message from the PCM and stores the mileage in memory. When the instrument cluster fails to receive the odometer message for more than 2 seconds, the odometer displays dashes.
Thank you for asking your question on JustAnswer. The test procedures are below in pdf format, (just click on the link below).
CLICK HERE FOR TEST PROCEDURES (REFER TO PINPOINT TEST "G")