I recently had an identical problem with my speedo moving around between 60 and
80 at about 70 mph. You could just average them but I dropped out of
engeneering in college because of calculus II and the aging process has further
dimmed what little mathematical abilities I may ahve had. Nevertheless, I
removed my speedo which was not much trouble but the reinstallation is another
matter. As previously suggested I also removed my speedo cable and discovered
too much grease on it (I wish I could blame it on a DPO but I did it myself).
After removing the grease I still had the problem so I removed the speedo
(again) and disassembled it. I discovered some grease had gotten into the pan
looking thingy on the back of the speedo (technical term-don't try this at
home) that spins around and tells the speedo needle how fast you are going. I
sprayed a can of carb cleaner into the pan thingy and eventually all of the
grease was dissolved. I then sprayed a very small amount of good oil
onto the worm gear mechanism that drives the spinning thingy and reassembled
it. It seems to work fine now though I only drove it a few miles since the
repairs.
Mike Lunsford, 1970 TR 6
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