I have wiring and charging questions for my restoration project...

[MotoRider420]

To get more of an idea of what I am working with, check out these videos:
http://youtube.com/watch?v=kxNCJngtgt0
http://youtube.com/watch?v=lITukYqJBgk&watch_response
http://youtube.com/watch?v=GWKgt8JdFpg&watch_response
http://youtube.com/watch?v=NJr1hjeXqtQ&watch_response
http://youtube.com/watch?v=jZ0_ku5E-wQ&watch_response
http://youtube.com/watch?v=jWK2dvaIJS0&watch_response

I have ordered a new F&R, and a new speed board assembly with solenoid. I will also be getting new batteries.

What kind of wiring should I use for the cart? A parts supplier told me 6ga jacketed is fine for a stock cart.

Also, how do you hook-up a stereo? Do you connect it to two 6v batteries? Or do you use a voltage regulator so all batteries are drained equally?

THANKS!!!

P.S. Is $200 a good price for a used 36V - 25amp battery charger? I have attached a pic of it...