When It gets cold or cooler in the mornings, and I am driving my 1992 tercel there is a high pitched vibration that is causing my gas needle to bounce and the speedometer needle to go way past the 110 mph that is listed on the guage. Now I would love to believe that I was actually doing 110+ in a 1992 Tercel, but I know thats not the case since I havent added a thing to the car. It was actually pushing the needle so hard the needle broke in half. Any ideas of what could cause such a strong vibration? If it helps there is no additional strain on the engine or the car, but it is getting annoying and I am a bit worried there maybe something major wrong. Some suggested that it was motor mounts or accelerator cable? Any help would be appreciated!