ohmigod.ohmigod.ohmigod! I think we have the same car!! does yours have popup headlights?

I found 7 guage wire to be HEAPS, in fact if your car is nerly identical there should be a wiring rubber boot coming through the firewall on the passenger side. My model has an extra plugged off nipple for some non-installed wires which is the right size for the 7 guage wire. Just cut off the end of the extra nipple (oww) and you'll need to use a piece of fencing wire to poke through the hole to draw through the power wire.
I have a fuse in the engine bay almost directly off the battery for the power wire, I forget what amp fuse I run though.
I take a feed off this in the passenger foot well for the empeg and alpine.
I run the power wire past the passenger to my 'amprack' mounted on the back of the rear seat.
The signal lines run down the middle of the car under the carpet.

Murray
I made a conscious descision in a semi-conscious state