Where to tap for switch illumination?

I'm getting some preliminary wiring done for putting a bunch of CH4x4 switches in my truck and was wondering where I should tap for the letter illumination. I was planning on being fancy and hooking them up to the dimmer, but I've read the LEDs don't dim nearly as much as the factory lights, and I'm not anal enough to put new lights in the switches. I figure there's probably a fuse location I can tap that will only turn on when the headlights come on, so the switches will look as oem as possible. I'm not opposed to using vampire clips on another circuit that comes on with the headlights, but I'd prefer an add-a-fuse. Where are you guys tapping for switch illumination?

 

Behind the AC controls is the easiest

 

light source for the radio is another good source

 

true but you have to remove radio to do that. Popping out the AC panel only takes about 3 seconds and is the "easiest" to tap into aside from one of the buttons on the side such as the fog lamp switches.

 

That's where you would make the dimmable connections anyway right? I guess I'll go ahead and do that anyways. I beleive I saw the green wire is the power source and the green/white wire is the "ground" that goes through the reostat? Would it be too much to pull illumination for 10 switches from that circuit? I dont think the leds draw much, maybe a collective watt if that? I'm running these wires to a 10 button meso panel for reference.

 

That's correct. I think you'll be ok, I'm running 6 or 7 LEDs from carling switches through there for the last several years without issue. If you start hooking up incandescent is probably where you'll exceed the rating and burn out the stock dimmer.