Thank you everyone, your advise was very welcome and I was able to get the brake lights good as well as mounting the second tail light and sliced in! The wires leading to the brake light switch were corroded/loose and weren't great, so had to address that. For now, I will still use the old school method for the turn signals... hands!!!
The condition of the wiring is original as is most things about the truck. It has been parked in my grandparents outbuilding for as long as I have been alive perhaps longer. I did have to remove the cloth cover on the driver side light to fix it and add the second brake light to it. Only thing I see that isn't original would be the welded bars to the fender, back bumper as the truck was used in farming and the radio. I've also got all of the hubcabs, jack and the hand starters that came with it.
Now onto tires, which I will need to figure out what size radials work with these stock rims.
I've attached some pictures of the truck. First time its ever been photographed online