1971 dodge fuse box??

The wiring under the dash of my 71 Demon is a mess. The previous owner cut, spliced, and taped it all up. I have been trying to find information on the fuse box that is currently in it. 2291593 mopar fuse box.

What fuse box was made for the demon? Is this the original one or has it been replaced?

Everytime I look under the dash I get overwhelmed with the amount of tape and wires just hanging about. The dash lights and some of the guages do not work. Fuel and speed guages work but the amp and heat do not.

Obviously I do not know anything about the electrical side of a car to save my ***. Any info out there for a beginner? I have a wiring diagram comming in the mail for my car. Hopefully that will help in figuring out what I can do to help fix this issue.