so on my way to work today i am taking the same way i've been taking for 2 years. i'm on a back road to go around traffic on 140 and the speed limit is 35 but it's long and open and i have never seen a police on that road at 8 in the morning. every day i do like 50-60 down it. i know that is bad on my part but it's been the same basically every day for 2 years so yeah. well today there was a police man sitting on the other side of a small hill getting people with a radar gun. i was doing 55. i wasn't quick on may feet and didn't think of anything to get out of it because it was fucking early and i got no sleep last night. i just bought my car and i still have a temp tag in the rear window. he asked if i had the spedometer checked when i bought the car. i was like "no, should i?" he said i should take it to a shop and have the spedo checked, and if there is something wrong with it that makes the speed wrong and i can prove it then the whole thing will get dropped. he then made the ticket for 49 in a 35. so after all that, here is may question. what could i disconnect or mess with that can make the spedometer mess up? like i could just disconnect, take it to a shop, have them fix it, then use that to show that it was messed up. please help me. thanks in advance.

nigel