Just bought a 66 tbird and everything is pretty straight, I love the car, but the main impediment to me registering it is the spedomometer, which typically reads about 50-60 when I am going much slower, it also doesn't seem to increase linearly with speed... As if it reads 55 then I step on it, accelerate maybe 15mph and now it says 55.4 ... It is sort of like it is sticking, and bouncing up and down a bit too...

I really want to keep the cool long red line speedo if I can.