Now I would find a hot wire somewhere before the dash panel, probably a connection from the 12v cigarette lighter, splice wire from there and run wire to fuse holder, which would hold the 3amp fuse, then wire from the fuse holder to the positive lead on the usb soldering connector, and then a ground from the positive lead to a ground mount somewhere in the car. Then simply put the soldering connector in the dash panel somehow.

I would use one 3amp fuse for a pair of ports, and would have 2 pairs, one in the front and one in the back.

Now my questions are, what size wire should I use for this? Do I need any diodes or anything? Do I have the right fuse size? Should I have a resistor or anything of that nature? Does everything else sound like it should work fine? I'd also imagine that the current would already be DC since it's using the car battery, but I could be wrong.

I don't have a ton of knowledge on electronics but I feel like I have enough to get this simple task done. That's why I want make sure every thing sounds right and don't end up messing something up.