A harness to connect the new head unit to the OEM harness is a good idea. They are cheap and makes installation easier. They also give a diagram for you to follow so you know which wire is the "remote" wire. As for new speaker wire, buy a roll of 12g or even 14 g wire. They will all be coming from. The amp and routed to the door speaker. The romex opens with a simple flip of the locking mechanism. You have to close the door a little to get the locking mechanism to open all the way. Use a sharp utility knife to cut the pin board for space to run the wire through.
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