I bought my panel meters off e-bay but none were lit but that was rectified with some Christmas lights. Most run at 2.5 volts so run 5-6 in series for 12 volt power supply. I drilled a hole in the back for a couple of bulbs each. I actually used the M6 LEDs but the old type will also do. If you can find some old globe or pearl bulbs they can give the appearance of panel lights. I found some at the salvation army store cheap.