I have done two installs of the Oxfords, one on my 2005 and then again when I got my 2017. Both went smoothly without any drama. I ran my power for the Oxfords straight back to the battery. (Fused of course!) This seems simple and it works just fine. It has never given me an issue in all these years.
As for putting on the grips:
They tell you to cut off the old ones. Well, I don't like cutting off grips....just a personal thing about cutting up or destroying any good part. What I do is take a love very thin screw driver and start working it up under the grip (from the "inside"....i.e. center of the bike working outward). If they don't just pop loose I give a little shot of WD40 up inside and work that around. The old grips almost jump off!
I clean up the area where the old glue was. I have not put glue on any of my new Oxfords while installing them. (and in twelve years none came loose, BTW). I get the bars perfectly clean and then I put some straight dish detergent on the inside of the new grip. Not too much, just a few drops smeared around evenly. (This is how we use to mount those stiff beaded tires on my old off road race bikes. The detergent makes the rubber slick but then it dries out and gets very sticky, like glue).
With a little detergent the grips will slide on with a little help. I use a rubber mallet or dead blow hammer on the end, or just the heel of my hand, and pop them on. Once on I let them sit so the detergent can do its magic and turn into glue. OH, BTW, if you ever need to remove them.....just spray some water or Windex up in there and they will "release" and come off.
You need to put some thought into where you want the wires to the grips to be located once the grips are on. The right side needs to rotate so you have to make sure it has room to turn through its arc without hitting anything. The left side you have more space to work with as it doesn't move. As for the switch, I just use the mounting hardware that came with it. I removed one of bolts that hold the switch gear/mirror mount on and attached the mount there. Note that you might need to bend the bracket to suit your mounting point. Its easy, just clamp it in a vice and carefully reform it to make it fit where yo would like it.
'17 DL 650 Vstrom, Best value ride of all time. (replaced our '05 Wee)
'07 Triumph Tiger 1050 Feel the Power! Culled from the herd...gone but never forgotten.
BMW K1200 GT, Gone but never forgotten
BMW K100 RS, Beautiful German engineering
Husky 250WR, (1986) Last of the real Huskies made in Sweden
Bultaco's ...for those of you who remember....
A long list of so many others.....
Happiness is having a motorcycle with more power than you will ever need.