Speedometer bounces all over the place

Thanks for the info, will the speedometer come out by the front or does it come out behind the dash, putting my new cable in was a real PITA laying on my back trying to feed the cable into the speedo

The speedo should come out from the front. You probably have to drop the steering column, and you need to take the lower speedo cable off the transmission so you can pull the thing out of the dash.