After Market Ammeter?

When I purchased my car, it came with some spare parts. One of them being the old wiring harness, I inspected the bulkhead connector after learning about the amperage problems with the bulkhead connector and found it to be melted.

So I would strongly recommend upgrading the wiring and bypassing the bulkhead connector for anything high amperage, the alternator and headlights are the main things that come to mind for me. If you wanted to run an ammeter I would bypass the bulkhead terminals as well and run some new wire, depends on what you want.