haha, this has recently happened to my in my b4 90 and if I smack the dash just above and to the right of the speedo, the speedo starts working again....smack it again and it drops to 0 and my odometer stops as well...has happend 2 times so I assume its just a loose connection on the speedo sensor.
ahahaha...that's the funniest thing I've ever heard. I used to do that with my old mustang. But this sounds like your A) loose connections or B) the speed sensor is pooched. See on the mustangs it was a gear that made the speedo work from the tranny. But yeah check those 2 things and good luck!
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