Even though I know you said it bounced before stopping and you did not mention any other issues. Start at the source and pull the fuse and clean the ends. My speedo would work intermittently until I did so, Also if the fuse has the silver( aluminum) fuseable metal change out to the copper ones.

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92 500E Silver 66k
82 Porsche 911SC 84K
68 Cadillac ( Gone Now )
03 Suburban Z71 200K
85 300SD 217k From Original Owner ( Dad )