i also blew that rubber block off. looked to tight under the car, and the wire routing looked like it would be a head ache.

look around on the d/s fire wall theres rubber grommets there already.

i drilled a hole under the windshield, took the pass side cowl off and under the the window, i drilled a hole, fed my amp wire through the hole and it came out the pass side to the floor like it was made to.

that worked for my amp. the oil pressure sender is real close to that area. so food for thought.