Wiring help needed

Thanks for the quick feedback guys!
70chall440, I was thinking about using something just like that. For lack of proper electrical nomenclature - I'll call it a sub panel for my car? LOL
Where would I tap in? Would this loosen the load on the factory setup?

67Dart273 said

What are you doing about the bulkhead connector and ammeter? Or is this an external shunt setup, might be? If you keep the ammeter, make certain it's in good shape and consider silver brazing the studs to the shunt

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Del, I am keeping the original bulkhead. I'll be using all the factory gauges except oil light, and temp gauge. I would like to run both my Autometer mopar temp gauge AND my temp gauge in the dash but I am using a 65 SS HEMI water pump housing and have no more ports and don't wanna drill one.
What do you mean by keep the ammeter?
There's a lot more here that I don't know, than I do know!