well, I just finished installing the 81 speedometer on my 82 and I think the only thing different is I no longer have the self cancelling turn signals....that being said, mine didn't work very well to begin with so no loss to me and the new speedometer seems right on with my tach readings. I sure do hope I never have to change it out again....big pain in the butt if you don't remove alot of stuff to get to it. I didn't remove anything and my fat hands and arms didn't want to go in those tight spots very well...lots of cramps and cussing after dropping nuts and washers.