The first thing I ignore is this part of the diagram. Instead of wiring the “isolation switch” to switched ignition, I just wire it to constant power at the fuse block. As always, make sure to use a fuse. As for the dash illumination, most newer Jeeps have illuminated switches and you can score the power there. In older Jeeps, just splice into one of the wires going to an existing dash light, which are usually orange. If you don’t care about your switches glowing in the dark even when the system is off, you can skip that wire. Everything will still work just fine without it hooked up.