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pinbal!!! - HA!!! - I have not seen that, but I do see just a slight slight wavering when I'm cruising between 70-75 down the freeway.(with the Speedo, that is)
as long as your speedo dosent start bouncing in the range of + or - 10mph and make a 'whizzing' sound as the stripped gears attempt to still work.
i recall this happening on one of my other cars a while back
The needle wavering at 70-75mph is very common and odd. The only time my speedo needle jumped or moved when it shouldn't was one time when my ignitioncoil was causing it to miss at an idle after washing the car, it jumped up to 5mph when it was running in neutral. The only other speedo problems I've ever had was with my '88 Daytona Shelby-Z, it would only work half the time and kick in and out at will with no noise or apparent cause and continued even after the speedo gear was replaced (it was plastic and undamaged).