Just need some help...
 

so i have a few things wired up in my runner and im not so confident in my eectrical skills maybe someone can poit out any mistakes ive made.
what i got...
an aux 12v outlet that always has the radar detector plugged into it and the cb that go into one 12g wire that goes through the firewall and has a mini blade fuse holder with like 20a? fuse in it... both the cb and the aux 12v are grounded in the cab to some bolt near the center console.

Also have a little switch that is cutting off the power to the pwr antena so that it doesnt go up i have some 14 g wire goin from the wheel well to the dash where the switch is i didnt ground the switch or use a fuse but i dont know if i need to or not?

also where is the cheepest place to get an aux fuse block NAPA wanted like 25$ that seemed a little high?

thanks for any info u got

also got a 800 watt inverter that i want to hard wire in would i need to use a fuse in a 8g wire that goes about 6 or 7 feet from the cab to the battery? would 8 g be enough?