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My wife was driving and she said the speedometer went crazy and started spinning around like a clock, then it started going wildly back and forth...finally it spun and broke about 3/4 of the needle off. Now it sits at around 120mph when stopped and when you go it kind of shakes back and forth about 50 to 90 degrees and makes a strange sound (we decided it sounds like the rattle you hear if you have the top on a pot of boiling liquid).
The same exact thing happened in my 72. The speedometer started bouncing around and after a few miles, part of the needle broke off. This happened a few months back and I have yet to pull it out.