[duke36]

There was a fellow named Bob Bell in Manteca , Ca. who built and installed OD's. He provided a short 1/4" dia.rod that connected from the OD case lever over to the stock A tranny tower. A hole was drilled in the A shift tower to the reverse shift rod and when engaged prevented the OD from engaging while in reverse though don't remember the exact configuration as this was in the early 1980's and have no records any longer. No electronics were required.