Okay s my 2004 Hyundai Accent's Speedometer stopped working last week. it doesnt ever move at all. And also theres a weird shifting problem too. when I drive my car over 55 for awhile the car will kinda kick and then it will seem like it gets stuck in one gear. At this point I can continue to keep going fast but the car makes sound as if it cant shift and like its revving up. Its weird. and when this happens after i stop and go again the car will take a minute before it starts to accelarate. Now I dont see why the tranny would be bad. Could the speed sensor be having a problem? Like being broke and causing it not to work properly? And what causes a Speedometer to stop working?