The speedo is electronic , and has an internal " stepper motor " to move the needle according to info the controller sends it . Sounds like your speedo has developed a temperature sensitive binding and the speedo may require replacement . Speedo may have a manufacturers name and part number on it , so if you could find that you might be able to track one down on line.
If your cruise works then the speed sensors are working and supplying good info.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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