Why do my speedometer jumps while idling or when I turn up or down my AC. My speedometer jumps while I'm driving too, what causes it to do that. I thought my AC compressor is going on the blink, but I was told it might something else??

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This issue just started about two weeks my speedometer just started jumping up and down while I'm driving or parked from 10-20 mph and it is causing my gas pedal to stick. I have to tap harder than normal to accelerate even while driving at a slow pace because of the sticking gas pedal?? I thought it might be the AC going out, but I was told it might be the wiring are crossed or giving out false reading to the speedometer?? What could be going wrong with my car? Everything is fine on the car? Thanks!