hey i just got a brand new deck, amp, and speakers. My car(240z) only had a radio so i plan to rip that out and run new speaker wire. This is how i think it supossed to set up someone please correct me if i'm wrong. Wire the deck up to the orignal power wires along with the antenna, then run coaxail cables to the amp and run speaker wire from the amp to the speakers. For the amp i need to run a wire to the positive terminal of the battery and a ground wire to the body. What gauge wire should i be using for this? and should i run a swicth for amp? its aprox. 5 feet from the amp to the speakers.