Thanks for the tips. I like the idea of the silicone tubing for an edge protector, but it doesn't give me much waterproofing. I suppose I could squirt some RTV in around the cables. One issue I really need to be careful about is waterproofing because my air exhaust from the radiator is a slot that shoots air (and potentially water when it rains) over the area of the firewall where all the fun parts exit. See diagram below.
-Tony
