7 segment prototype board for figuring out how to drive them. These are cheap 0.8" displays from eBay marked 8021AS. They're common cathode but there are separate anode and cathode pins for each digit, so they operate like two single digit displays in one package.
A 240 FPS slow-mo video and a slowed down scanning rate of 10ms per digit shows how each digit is updated separately.
The boards.
Testing the LED output. I think this pattern is a 7 segment sequence from the breadboard prototype.
Testing everything now. With all six columns scanning there is some flicker in person but it's not that noticeable.
The project finished and working with Assetto Corsa. I think it reacts slightly faster than the tachometer on the TV. BTW, who else remembers Sega's F355 Challenge?