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Take a very close look at the speedometer needle. At the bottom, near 0 MPH, you will see a small peg that the speedometer needle would sit down on when the key is off. Take a very close look and see if the speedometer needle is on top of this peg, or if it has migrated down to the bottom side of the peg.
That's exactly what is happening. The needle is trying to come up and work, but it's getting caught on the stop.
This is an easy fix. Turn the key off. Press and hold the trip odometer reset button. Hold it until you see the odometer light up and it will say "soF" and a number. When you see this then let the trip odometer button go. The cluster will enter into a self test where all the lights come on and all of the gauges sweep. When the self test is complete then your speedometer will be back on the correct side of the peg and will work again.