i have a 2003 polaris sportsman 500 HO. it has a new ECM box on it and the speedometer and digital screen worked before it was put on and now it doesnt. ive traced all the wires myself and the box was put on by a atv tech here in town. does anybody know about the problem? the box charges fine but then my other 2 things dont work now. is my speedometer and screen bad?