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You can try putting some sideways force on it while you twist/push, they were poor designs.
I guess the small plastic gears tend to strip. I've had little luck disassembling the speedo's and fixing anything in them, I just get another used one.
I seem to remember the one in my '90 (90-91 are the DRAC trucks, right?) was like that. I just clocked mileage on the gas receipts -- easier than trying to fix the thing.