As far as internals go, with the PC 2.0 you'll need two switches (at least one must be momentary), your main LED, a speaker, and preferably a 7.4v li-ion pack.

The PC drives your main LED by itself, so you won't need a resistor or buckpuck on the main LED. If you want accent LEDs, illuminated AV switches, etc., then you'll need resistors for those.

The aux switch on the PC must be momentary. The main switch can be either momentary or latching, and you configure it in the settings on the PC's SD card.

Read through the PC manual a couple times, if you haven't already. You can find it here: http://www.thecustomsabershop.com/Pe...-V20-P612.aspx