In the mid 60's General Aviation Manufacturers ran out of the old Barrel type DG's from WW II (believe they had H J Heinz imprinted on the face plate) and went to the new vertical card DG. You had to turn away from the heading to arrive at a new heading on the old Barrel type DG. Try flying the old Barrel type DG and you will realize how lucky we are today.

Also in the late 60's: Aero Commander, Beech, Cessna, and Piper went with the "T group" 6 pack instrument panel and attitude instrument flying was much easier to teach.

Cub