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may have come lose from back of speedo.

i had that exact problem... theres a little black clip on the end of the cable that secures it. mine broke off (not quite all the way, but wouldnt secure it anylonger) somehow, speedo started jumping alot or not working at all. pulled the instument cluster found the problem, pulled the cable used a couple of ruber bands around the end of cable & clip... havnt had a problem since and that was well over a year ago.

98' BBJ Grand Laredo 5.2 locked and loaded,.01' Gen III XLS. Frankenmonty lives on in another.