Right off the bat it sounds like a broken speedometer cable. As the cable spins from the gearing of the transmission it is clicking against the broken part of the cable running to the speedometer gauge. The frictional clicking is what's causing your needle to bounce around. Since the cable is probably broken and cannot spin long enough to move the odometer numbers. Raise your vehicle safely and disconnect the speedometer from the transmission. then see if you can pull the cable out of the housing. If only a portion of the cable comes out, then that should answer your question. Be careful when you disconnect the speedometer cable from the transmission as not to lose any small pieces that cause the drive mechanism to work.
How to trouble shoot
speedometer?
http://schematicsdiagram.blogspot.com/2011/06/speedometer-not-working.html
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why speedometer not working?
http://technoanswers.blogspot.com/2012/01/1996-fiat-bravo-speedometer-not-working.html
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Speedometer works but odometer not working?
http://technoanswers.blogspot.in/2012/01/speedometer-works-but-odometer-not.html-----------
Speedometer runs backward?
http://technoanswers.blogspot.com/2012/01/speedometer-runs-backward.html
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Warning lights on and
speedometer died?
http://howtobyme.blogspot.com/2011/08/warning-lights-on-and-speedometer-died.html
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ABS & Brake lights
warning indicator steady on dash and speedometer not working?
http://howtobyme.blogspot.com/2011/11/abs-brake-lights-warning-indicator.html
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Vehicles Cluster panel Not
reading Miles?
http://schematicsdiagram.blogspot.com/2011/12/vehicles-cluster-panel-not-reading.html
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Odometer works properly but speedometer works
intermittently?
http://technoanswers.blogspot.com/2012/01/odometer-works-properly-but-speedometer.html
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How odometer works in
cars?
http://technoanswers.blogspot.com/2011/11/how-odometer-works-in-cars.html
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Speedometer not working on Ford?
http://repairhelpcenter.blogspot.in/2012/02/speedometer-not-working-on-1993-ford.html
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This will help.
Thanks
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