In dash cluster aftermarket tach replacement-69 Cuda rallye cluster

Points ignition. The originals were designed for such.

To run any aftermarket electronic ignition the factory unit will need to upgraded.

My car came with it and was unhooked as soon as I bought it in the mid 80’s. I used a column mounted Sun Tach II unit and Chrysler electronic ignition. I updated it with a board from RTE to run with the pertronix when I restored and sold the old column tach. It works very well with the new board.
So, you're saying: find an old original tach, update it with a board from RTE to run with electronic ignition? Just trying to understand what you're saying.