After a fire.....

Hi there. You have a lot of excellent answers here. As there's no way I can tell with 100% certainty it does appear to have started in the bulk head and or the amp gauge. Old Mopars have had this problem forever. After you get everything cleaned up and purchase the new parts you can get started. Also there is no reason to run a amp gauge purchase a voltmeter that will fit and looks close to the others. Let me know what additional accessories you plan on running. I'll see if there is a part number on the one wire/cable that I use also (it will help a lot). If you'll like I could draw you up a schematic and can give you a tips. I wish you luck as there's a lot of damage here. Again there are a lot of excellent ideas on this tread.