reciently, my speedo has been making this light fluttery grinding noise. is this my cable or some gears? my needle slightly flutters till i hit 20 mph. your comments will be appreciated.

by the way, sorry if im crouding up this forum lately im just a profectionest when it comes to my car. it actually runs pretty good for being 13 years old, looks great too!
thanks,
adam

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87 300E
BLACK GOLD WITH CREAM INTERIOR, SPOILER, AIRDAM
CLEAR MARKERS

87 420SEL
BRONZE WITH CREAM INTERIOR