How Can I Fix The Speedometer In My 1993 Chevy Lumina Eurosport

The speedometer in my 1993 Lumina Eurosport is stuck at 120mph both when turned on and when off. The problem started after it was jump started. After the jump start the speedometer shot up to 120mph and has stayed there ever since, how can I fix this? Also, to add, it still starts up fine and everything else works including the radio and tachometer and it has 170k miles on it.
it isn’t a digital display speedometer, and it isn’t stuck behind a peg

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