1990 Toyota Camry speedometer and mialage not working

I got in my car the other day and i know for a fact that the speedometer was working perfectly the day before could the snesor have been moved if I hit soemthing on the bottom of thcar the night before I kinda went down a steep hill i though I heard the scrapping on the bottom i was trying to turn around and it was pitchblack out where would I look to see if somethign just got tweeked or moved or could it be somethign else? my tac still works and and fuel gadgue