wtf what? I spent some bonding time with a roll of electrical tape? Yea it was retarded.

I located some existing holes in the firewall, but I couldn't press through (translation: I was a pussy and thought I might tear the grommet). I could have drilled, but I swear there is no room down there to have a clean path at drilling.

I guess you cant see it, but the wire (in the loom, in the electrical tape) is actually in a piece of trim. The trim is not 100% waterproof, but it is generally well covered from rain, splashes, and the like.