So I picked up a 93 Cobra a few years ago, it had seen better days and I've been slowly trying to get it all right. One of the things that has been broken was the speedometer which I know is very common with these. The need was very jumpy up until about 40mph and then it would calm down. But even then it has not been giving an accurate speed. It gradually skews more and more the faster I go. So at 20mph it would say I'm doing 18-19mph. At 75mph it says I'm doing 90mph. I just replaced the speed sensor and the speedometer cable. I lubricated the cable before I installed it but after installing everything the needle is shaking all the time. No matter what speed I'm going it shaking. For example if I'm doing 75mph the needle will be shaking between 80 and 85mph. And of course it's still not showing the proper speed. I examined the speedometer gear when I was replacing everything and the gear seemed fine. That being said I'm not sure what gears are in the rear end. I was told it still had the original 3.08 gears but I have not verified that yet. I'm thinking it would have been more likely for someone to swap the rear gears and not the speedometer gear. My immediate need is to get the needle to stop shaking, and then I can figure out the gear ratio's and get it reading properly. I'm just trying to figure out what else I could do. I'm going to put the old speed sensor back in and see if the shaking stops. I'm just looking for any suggestions from fellow fox body owners.