Have an 02 Polaris Edge 700 and took it out on the trails for the first time this year yesterday. When I would get up to 73 MPH, the Speedo would stop there and not move and the Tach would be stopped at 7K. Was following a newer sled and they said we were up around 90 so I know I was going faster than the gauge was reading. Wondering what the possible problems for this could be. Thanks.