Seems like it may be a hornets nest, but it does look simple. Does that replace the classic Mopar junction box that sits under the dash?
Yep!
It's all contained in the one panel. What's nice is that all the relays are in one spot. Don't know about your Coronet but on my Duster there is a bunch of extra wire that serves the various relay junctions which are all over the place - both kick panels, dash, firewall, etc.
Is it worth doing it this way? I dunno, depends how involved you want to get. Once I started taking wires out, it became evident I would need to use something like this. It's really tedious to re configure all the dash wiring, better to start from scratch.
Most of these older cars need to be re-wired anyway. When you start taking apart connectors and stuff you will wonder how you never burned the car to the ground.
