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Another basic question I'm sure. What is the cause of speedometer needle "bounce"? It won't hold steady at any speed. Is this the speedometer itself or the sending unit? The sender is the stock unit on the TH400. (Before the "bounce" started it was reading pretty close to accurate at all speeds.) Thanks for any help. Ted
 

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A lot of times its because the inside of the cable gets either dirty or dry, take the whole cable out and pull the center out clean both inner and outer parts lightly grease and install, check for any fraying
 

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Also, I discovered that if the inner cable is a bit too long it will do that. The cable pushes in on the center brass shaft on the back of the speedo and it causes it to bind.
 

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The speedometer needle on my '56 will show the correct speed up to around 50 mph then it will fall over to the right and stay bottomed out until I drop back under 50 again. Is it possible that the above suggested remedy would solve this problem as well?
 
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