Check the cable to see if it is connected if all is well you could possibly need a new one In Ford's..sometimes the speedometer cable might need lubed as it gets older instead of replacing the whole speedometer. Outside the passenger compartment firewall inside the engine compartment under the hood near the driver's side, you might see where the cable comes out and connects to the cable going to the wheel. A lot of times you can disconnect this connection and drop oil down the cable and that will solve a speedometer which varies while driving.
Check the batteries (if any), or check the wires. If both are fine, then check for driver updates.
Timer is not a speedometer, because speedometer is used to measures the instantaneous speed of a land vehicle, while timer is a specialized type of clock.
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Hand it to him. He will be happy to take the evidence while his partner takes you into custody and reads you your rights.
start with engine off. press and hold that speedometer resetter while starting engine, check engine light will flash a few times then disappear.
Broken speedometer cable.
Possibly a wheel sensor, VSS or other problem. Check the computer diagnostic code to find out what's going on.
The speedometer of a car indicates the current speed at which the vehicle is traveling in miles per hour (mph) or kilometers per hour (km/h). It provides the driver with real-time information to help them maintain a safe and legal speed while driving.
Assuming this happens while you are moving you probably need to replace the speedometer cable.
check your transmission and gear so test if there ok if thay are dont drive your car for a while if its bad got to a shop hope i helped :)
most of the newer spedos are magnet drive , you may want to check , but the usual fix is to replace it ! Good Luck !