Just got my 69 Dart together and took it for it's first test drive. Speedometer is all over the place.As soon as the car is moving it bounces wildly from 0 to 120 and the faster the car moves the faster it bounces. At one point it stuck at 70 even when stopped then went back to bouncing and the next time I stopped was back at 0. Has a new cable and I checked routing and there are no kinks or binding. Had bench tested the speedometer and cable and seemed normal before installing. Odometer seems to be accurate. I am assuming that it is the speedometer itself that is the problem but want to get some opinions before I get into it.
