<<Step Three: There is a gasket on the left side on the engine compartment that feeds wires to the dashboard behind the glove compartment. By pulling the gasket back, I was able to run the power cord through the opening above the gasket.>>

I'm sorry to have to tell you, but that's a no-no kazama!
A rubber is meant to have the wire go through it, not over it. Ever thought of what happens when that very thin (sharp) firewall eats through the isolation of that power cable?
On a sidenote, you'd be surprised of the (engine) noises coming through that gap.

Frank (professional installer)