I've got two of them and both Yam 4s sleds are wired for them. My 14 LTX has Heat Demon's "Dual Controller" 5 setting switch mounted on my handlebars and the 05 has basically just a plug in for it. The vest comes with it's own controller that has 5 settings on it as well and that's how it's used on the 05.
I also installed Heat Demon's heated seat pads on both sleds. The 14 LTX seat is controlled by the Dual Controller (5 settings) and the 05 has off/low/high switch mounted on the handlebar pad.