Rookie electrical question

67 Dart...this was the first thing I did....deleted the amp gauge too, Ill run a separate Volt gauge to keep an eye on things...And Cracked...definitely wont be pulling any accessory wires from Mother Mopar harness ...The battery cable does run iinside the cabin...I have a circuit breaker at the battery, and everything will be fused and relayed under the dash, dont want my Barracuda to be a roadside BBQ...thankyou gents