There was a reason that CBS and other television networks used these type of displays on game shows when they had bright studio lights to contend with. The light is piercing from these!
Tonight, I got 22 wires soldered on 22 pins to mate with a Molex connector on the back of each display. Both digits are now directly connected up to the relay board. The software I developed can display an arbitrary 2-digit number, and then count up or down from that number until it reaches 00 or 99.
This has been a cool project! I’ll probably try to make a more detailed video in the future on the parts I selected and how all this works together.
Check out how this display worked on “Classic Concentration” hosted by Alex Trebek in the late 1980s: https://www.youtube.com/watch?v=1izUPd87wmw