Hacking a Ps2 analog controller

[the3eyedblindman]

I know how to hack a normal playstation controller with no analog joysticks, but I want to create an arcade and arcade controls out of a ps2. Now I know you just use an 8 way joystick, wires and soldering to hack the d-pad, and hacking buttons like x and y are real easy to do, but its the analog sticks that are confusing me, and alot of newer games require you to use them for your walking, steering, so on. Does anyone know what to use and how to hack the 2 analolog joysticks on the bottom of a ps2 controller, I really need help, please respond, thanks.