This is a PCB board I created for my Opencockpits Flaps Gauge so I can illuminate it using green LEDs.
It uses 9 3mm LEDS for lighting the the flap indicatiosn, with 1 resistor per led. A 10-pin 2.54mm header connects to these leds with a common.
There’s also a 3mm led spot for the “Flaps” text on the gauge for possibly backlighting. This LED has 1 resistor for it and a seperate 2-pin 2.54mm header for power.