JMO, selling the wire around wires for many years.
I suggest installing wire around and if the bulkhead connectors are in good shape, leave everything else in place after bypassing your ammeter.
I don't know of a mechanical connection that is more rigid/secure than weld.I have the Amp gage bypassed and the Red wire is done with the fusible link. I am worried about the Black wire because of the welded splice's... Thanks