Noisy Speedometer

73NorthernDuste said

Try some powdered graphite in the speedo. Put it down the hole where the cable plugs into the rear of the speedometer. It really helped mine a lot. Also lube the cable too as hypermite suggested.

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I had a 70 Swinger with the speedo that would bounce. I pulled the cluster out then took off the cable, shot some graphite in there, actually a lot of it, then put it all back together. That cured my problem, and this was back in the 80's. Hope it works for you.