Bulkhead bypass vs ammeter bypass

Run a protected direct charge wire from alternator to starter relay and leave the OEM wiring in place. Make darn sure the bulkhead connector is in great shape. Mad is OK, I perfer to not cut up harnesses. The cutting can be avoided.

Those packard terminals I'll use a 56 as an example, you don't really want to run more than about 20, maybe 25 amps on a spike across those connectors. A 60+ amp load from an alternator is not kind to bulkhead packard connectors.