Hi out there,
finally the Cuthulu's arrived. Cuthulu is a little piece of hardware to built up Playstation 3 and PC Controller, mainly Arcade Sticks. The advantage against the UPCB or padhacking is the really easy assembly.
I've pimped up clear push buttons with red LEDs and wired them as easy as possible. Take a look:
Connect LED Cathode (black wire from led) to Button Signal Line.
Connect LED Anode to VSS (Red Wire)
Connect Button Ground Line to daisy chain GND (Black wire without led connection)
Connect red wire to VSS, Black wire from led to button to signal. And one black wire to GND