I would say the best way to do it is take apart your switch area to get to the wires and find the positive lead (I would say for your foglights in case oyu want your headlights on and not your neon) and just tap into it and use it as a power source for your neons. unless someone has done this or you have a repair manual the best is just going to be trial and error. be sure and pull your headlight fuse first as to not blow it or cause a short.