Brake light switch and rear lights help

Alright guys and gals, Ive been patching together spotty wiring to my 72 plymouth duster so i can get it street legal ( Ive owned it for a year and hasn't been registered yet). The question i have is as follows: Where is the brake light switch, and could someone please show me a pic of it installed? Pretty new to the mopar family. (cut my teeth on aircooled vw's back in highschool and wanted some muscle) Also, my rear lights are extremely dim, and you can't even tell they are on untill you remove the lens covers. I saw a thread about the ground needing to be good and clean, but wanted to make sure wires are actually connected to the switch