Once you have the switch installed a blue lead plugs into the switch lead and runs under the carpet alone the passenger side trans tunnel.
From there it is covered by the metal wire shield and under the seating area.
The rear package shelf will need to be removed.
Most non-rear speaker cars had a solid package shelve cover, this would require a speaker grill and was always part of the dealer-installed speaker package.
If your car came from the factory you would get a mesh rear package tray cover and this has perforated holes for speaker/sound.
With the tray cover out there is a speaker mounting provision at the center on all cars.
There are four slip-on bolts/clips that get slipped into 4 holes these hold the speaker up against the underside of the rear shelf.
There is also an insulated cardboard speaker enclosure that gets installed over the speaker. The wires will run through the hole in the cardboard enclosure.
Hope this makes sense.
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When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car. 
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