I got my speedometer cable in today and put it on right away. It works, the only thing is the speed is off by about half. Is there a way to calibrate it? I was reading something on the internet about the worm gear and the possibility that i might need the correct worm gear that goes in the speedometer. Its aggravating that i bought a set of gauges on ebay that are suppose to be for the 3a, and apparently the speedometer wasnt.