JEEP GRAND CHEROKEE INSTRUMENT CLUSTER GAUGES SPEEDOMETER

I've Had Issue With The The Speedometer Needle Bouncing All Over The Place Every Occasionally When Driving And Then Just Recently Once...

At Any Speed, Speedometer Jumps To 120 Mpg On A Incline Through Transmission Out Of Gear. Where On Transmission Is Sensor Located And Looks...

Speedometer Starts At 10 Mph When Cars Idling. So, I'm Always Going 10 Mph Over The Speed That I'm Actually Going. Any Help On What...