[quote author="capnspoony"]
I read this before and I'm still not sure, sorry. I just don't want to hurt the circuit the first time I turn it on [/quote]
LEDs come in many varieties. Colour, size, brightness and so on.
For 'your needs' Richie, they all need to be of the 3mm variety.
10 of them being one type for the meter and 1 of another type for the in/bypass switch.
For the meter they will be single colour 2 leg. Get the colour and brightness of your choice. Play with RM1 to get the desired brightness.
For the in/bypass switch, the pcb has provision for a tri colour, common cathode led. That is a 3 leg jobbie, with the centre leg being common.
Get whatever colours float your boat and use the appropriate resistors for each colours requirement.
peter