I used the factory switch. The fog lights wired up perfectly but you do have to take the harness out of the factory bumper if you want to do it with no splicing. I love the bumper, never see many like it, and with the skid plate it looks great and it covers all the vitals well.
I had this on our 2012 Rubicon, I really liked it, but my wife didn't like opening two things to get to the cargo area. I reinforced the tailgate on our JLUR for that reason.
I looked for something different, and found the Deegan 38 from Extreme Terrain. I wanted a bumper with a fitted skid plate, and it looks good all together.