SO I got pulled over yesterday for speeding, but i didnt think I was. Officer clocked me at 52 and my speedometer said 40.

I put the car on a road load dyno and have come to find out that in 1st and 2nd, the speedometer reads 12-15 fast on acceleration, but once you cruise at a steady speed it comes down to within 2-3mph.

Its also off differently in each gear. 6th for example, at 75 im doing 83.

I already have a certified statement that my speedometer is in fact, wrong, which means the solicitor and judge will lower the speed by that many mph, and when they do its below GA's 10mph so it gets dropped.. but im not sure what is causing my speedometer to have a heart attack