so were you speeding?
"Yep. I need it to read like 55 but my speed is actually 60." -- huh?
So, did po-po get you on radar, laser, or was it a clocked speed?
You won't beat any of these, unless the ticketing officer or prosecutor doesn't bring the calibration info for the detection tool he/she used.
If your speedo is "off" and your state inspection requires a calibration, then it would make sense to be compliant, especially if you speedo "error' CAUSED you to exceed the speed limit. If your vehicle needs something fixed, get it done. It will show an act of good faith, you are trying to do what is required.
I bet it was more like your left foot, or a tail wind, or perhaps a steep downhill grade, that caused your speed.
I am no lawyer, but I haven't lost in court yet.
Good luck.
Duhockey
By the way...a "5mph over ticket" is sort of a gift. In my state the minimum is 10 over = $95.
If someone gets a ticket for "5mph" over the limit, it is more than likely what the officer chose to write the violator for, not their actual speed which was probably much higher. In my (not so perfect) opinion, human nature puts most operators at approx. 15mph over the limit. They try to blend in with traffic. In most 35mph zones peeps travel 45-50mph. 70mph, in a 55. So if local/state authorities REALLY wanted people to go 35, they would post 20. 55, they would post 40. Just my two cents, and yes, I accept change.