I bought my truck in august and bought the jake brake at the same time, which was self installed, it was fairly straight forward to do, just took some time, and a second set of hands is very helpful. As far as the switch i installed the shifter mounted switch that came with it, it has four wires, a ground, power, wire to ecm, and then an extra that i believe would turn the light on the switch on if installed (i opted not to install that). However, as soon as i was driving the switch was rattling like crazy and making all sorts of noise. I but a hair band from my daughter around it. Recently i decided that this looked quite tacky, and back to the dealer i went to request another switch, which they promptly ordered for me no questions ask. Looking at the switch you should be able to cut the wires and mount any type of switch that you would like to it. There is nothing special about the switch, any switch that has 3 wires coming out of it will work. Hope this helps anyone making a decision, I am thinking about getting the dash mounted one as it looks like a very clean setup and there would be no worries about rattling.