Oh, man, what a sweet 2-door! I think you nailed it with those rims. Rarely do I like aftermarket ones on the old "C"s, but your combination works.You got a lot of work coming. I wouldn't put the shocks or gas tank in right now. No point in putting new parts in to have to take them back out later. Stop by Grainger and get one of their portable sandblasters. It's a small unit that holds about 50 pounds of blasting material. Get an air compressor for it too. Sandblast all that rust away and paint the underside. In the process you will need to weld over some holes and replace those rotten lower quarters. I got a wire welder years ago, works great for this kind of stuff. Might find one on craigs list. A set of metal burrs are needed for cleaning up the welds. An angle grinder is your friend too. Lots of youtube videos on welding patch panels. The underside isn't as critical appearance wise, but you want to stop the rust now. As Neil Young said, rust never sleeps.
Lots of folks on this site that have been there, done that. Ask questions, it's your car, modify it as you want. We're here to help a mopar fan. I'm a 66 New Yorker fan: View attachment 419227
With a little luck it could start like this:
View attachment 419222
And turn into this along the way:
View attachment 419223
And finally View attachment 419224
It becomes an addiction when you get to this point. You won't want to stop. Good luck and ask lots of questions.
That wire should be the power wire that takes the reading from the gauge. Additionally, you should have a ground strap from the metal fuel line on the tank to the metal fuel line on the body. Below are pictures of the connection on the fuel line (with the two clamps, which isn't necessary, my dad and I just did it to ensure a good connection) and then the connection on the body, which we bolted down using the bolt for the fuel line clamp. However, you could also just run the end of the strap around the car's metal fuel line as was used on the tank's fuel line. In the pictures, you can also see the wire that you have on yours to the right of the ground strap on the tank side.If I'm right, that's the one single wire that plugs externally on the sending unit yeah,? Well...it clicked into place I felt like. Tomorrow I'm going to lift Daisy back up and recheck it there first.