Open hardware projects tagged 7-segment-display on BoardRepo. View schematics and PCBs in the browser and download the sources.
Open source 7 segment serially controlled led display that fits inside a generic 45x26mm panel mount plastic enclosure. Upgrade your function specific panel meter PCB with a new one controllable by your preferred MCU.
Some random examples of specific module usage in Arduino
Digital Up/Down counter using CD4029 and 74LS47 ICs with a single 7-segment display. Includes manual clock, reset, and direction control.