Yes took bulk head connector apart. It has been replaced in the past due to ammeter melting red wire. Previous owner did wire bypass for voltage gauge.
In that case it may have the same problem now that caused the connection to the ammeter to melt. :(
A good reproduction harness may be the way to go, although pricey, especially for instrument panel side of the firewall.
You could also repair and restore them. Some people have done that. Lay the whole harness out on plywood or similar. Mark the connections, unwrap and then replace or splice as needed.
Either way save the old harnessed for future reference and parts. I'd have been jammed on multiple occasionals glad if I hadn't saved the orignal harness.
