Just for future use, you have an Edge COMP. The Edge EZ is a different box all together. Just might help down the road in a future discussion.
Personally if it were me I would bring the box in cab just to keep it from the under hood environment. Its electronic, keep it out of the heat..... and it will look alot nicer when you install it in the cab vs sitting under the hood. With just the data plug hooked up your levels are useless. However I am unsure if the sub levels will work for adjusting smoke control.
Anyone with just the data plug hooked up got an answer for that? Do the sub levels on the COMP work like the jumpers of the EZ???? Anyone?
My wire has had a pierce since about 3000 miles on the truck.
When you start modifying things, regardless what ANYONE says... be prepared to be your own warranty station weather the wire is pierced or not. Some people just don't understand that... ... .