Keep in mind though that longer runs need thicker wire.I just wired in a 12V power port to the center console. There is a USB in there but no 12V source. I needed 12V power to plug my CB in to. I use a hand held CB with a car kit.
I used the factory provided pigtail under the dash for constant 12V battery power. It is fused for 10 amps. I was surprised that wire gauge was so small, 18 gauge I think, but it only carries 10 amps. I upsized my wiring to 16 gauge. No need to go bigger when it is fused for so little.