Honda civic 1996 speedometer jumping to 20mph then staying there?

i recently bought this honda civic, had the check engine light and the only code that popped up was p0501, i ended up replacing the vss as thats what i thought the problem was but my speedometer still doesn t work. I dont know much about cars so i dont know what else to do.

also everything else on the dash work like gas gauge and stuff. Thanks in advance.

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