I just installed a Jacobs E-brake. Mounted a toggle switch on the shifter, did not use the rocker switch that came with the kit.
I used a Neihoff $5 lighted toggle from the local farm supply store, but a universal push/pull headlight type switch would work too.
I bought a foot long piece of vinyl tubing 3/4" ID, 1 inch OD. It was clear, but I spray painted it black, lubed it with a little dish soap and then slid it over the wires that I ran up the stick, and without a close look, you'd never see the wires. Looks a little neater/professional in my opinion.
For right now, I just taped the switch in place, but when I get caught up again, I will build a bracket for it. Dad built a bracket for his, and loves it.