74 duster elelctrial help

Okay so I traced these 2 wires going into the firewall. This is what I found. The red wire from starter relay through that 30amp inline fuse goes through the harness in the dash to the ammeter plus side on the gauge. The other wire is the alt feed wire it’s green going though the wall and as you can see in the second picture with the butt connector the wire came out when I pulled the electrical tape off. The last pic is the welded splice. Other than that connector I don’t see any other issues in the ammeter circuit other than that 30amp fuse being too small. So what’s the best approach here . Should I delete the guage ? Put a volt gauge in ? Leave the origanal way with the ammeter and just fix all the wiring and run the 10 guage wire with the 14guage fuseable link from alt feed to stater relay positive.

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