Why would speedometer needle bounce
The needle bounce may be related to the cable, it may be broken or just needs lube.
Remove the speedometer cable, locate the connection at the transmission and unscrew it, then locate the connection at the rear of the speedometer, remove the cable from the car, pull cable out of plastic housing and see if it comes out in two parts, if it does then cable needs replacing.
You will see the cable has two ends, is the cable is broke replace it, a broken cable will sometimes spin and not spin causing needle to jump, also a binding cable will do the same, if cable is good then spray wd40 in to cable and spin by hand. note; if cable is binding you will need to work it so it does not break. good day
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