Speedometer off calibration in dash

I Have 89 dodge aries le. The speedometer jumped to the 55 mph mark. It still works but is not accurate. My Question, Does this speedometer work on a spring? Can it be wound back? You can only estimate the speed up to about 40 mph now. Any help would be appreciated. Thanks Dan

I found the problem. I removed the spedo and found that there is a small copper spring that returnes the spedo to its resting point. My spring came unwound. Trying to rewind it when it broke. Now its useless. good news is that There are lots of them available on car-parts.com. Just thought someone might get something from this.

Try my speedo messup. it jumped to it's max one day and ended up driving 9 miles to work while watching the odometer roll over like i was doing over 200 mph. having my girl calculate all that stuff because I suck with math, the car registered 242.387 MPH, while sitting at a red light in drive.

odometer was rolling so fast you can hear it rolling...