keep ammeter? / hack job

I do not know for sure- but I thought so because:
1) it is red and looks like 12g
2) when it is unplugged from the bulkhead I get no lights, no gauges, no starter (using the key). Plug it back in and it all works.


Ok, according to 2) your car has lights and starts now? You earlier post said you didn't have lights or anything.

I would say the best way to fix this is to
1. Get you a wiring diagram- priceless..
2. Get a decent soldering iron, flux solder, quality (thick) heat shrink, and a new piece of fusible link (you can buy this at your local NAPA dealer that has the plastic tag on it like the original did).
3. Do a good quality repair (solder, heat shrink- keep it all real neat). Make sure to look at your the spade connector and see if there is damage. Repair as needed ( you can get new connectors at NAPA also).
Here is one of many articles out there about repairs to the bulk head connectors.
http://www.moparfins.com/repairs/Electrical/Bulk_Head_Connectors.htm