Hi, new to the board. Need some help.

My speedometer started failing some time ago. It would jump to 20 mph and shake a little around it when I drive slow, then just stay there when I speed up. It recovers sometimes and shows the right speed. If I kick the daily miles reset button a few times, it starts working occasionally. It also often kicks in when I drive longer on a highway. Is this the speedometer, the wiring or the speed sensor?

 

could be either. I would check all of your fuses and then go to the grounds. If you can jiggle things and you get reaction then it sounds like a loose connection somewhere

 

if its not a loose wiring, it could be your VSS, and if not that just your speedo's f*ed like mine did...