usually a drill bit, but depends on the type of rocker switch too. if square, you can use a drill to get a hole big enough and then a utility knife or body saw to square it off.
Also, I tried the Daystar switch panel like above, but with a manual, third gear turned the switches on.
'07 Unlimited X - RED - winch, mod front bumper, 2.5" lift, 35" BFG KM2's, skid row skid plate, BackUp Camera, Custom Switch Pod, CB / PA, Congo Cage customized to full rack with light bar and rear ladder, more to come! (roof tent is not too far off, getting ready for next Easter Jeep Safari trip)