If your aren't on the RPM mode it's a sensor or computer problem
Broken speedometer cable.
Assuming this happens while you are moving you probably need to replace the speedometer cable.
If it only shakes while moving, have your wheel bearings checked. SOON!
Speedometer cables can dry out over time. Remove the cable from the back of the speedometer, and lube the cable with graphite. This should fix the issue.
The speedometer cable is either worn out or loose.
Just while they are in college.
Transmission problem. Yes it is related to the speedometer not working. VSS sensor may be bad. Have the transmission computer scanned. I had a flshing s light for a long time, while my spedometer worked fine, the car had trouble starting. I replaced the main relay under the dash and haven't had a prob since. I had the same problem with my 91 accord Ex...it turned out to be the alternator. The "S" light was malfunctioning along with the speedometer and Tach. While the light stayed on, the tach and speedo where intermittent problems.
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.
hold the speedometer reset button down while you turn the key on for about 15 seconds.
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start with engine off. press and hold that speedometer resetter while starting engine, check engine light will flash a few times then disappear.