HighPSI, I mounted mine the same way. I didn't have the switches, just a coin tray so I removed it and drilled a hole big enough for the cable to route through and then used adhesive Velcro strips to hold the tuner in place. It was quick, easy and looks clean.
+1 on RuffStuff Specialties.
I've used a lot of their products in the process of building my trail rig and have been please with the prices and quality of their products.
New guy from Indiana just dropping by to say hey.
I finally pulled the trigger on a 2013 F-350 a few weeks ago and while looking around I found this site. I've got to say after seeing some of the trucks on here, finding this site is going to cost me more money lol.