Wiring Fiegao & Gearing ? E-maxx

[RCHabit]

Hello, I have an E-maxx

1. I just purchased my 1st fiegao 8xl. I have a question on the wiring to a mamba max ESC? Does the colored wires on the mamba max matter where they plug to on the fiegao since the fiegao wires are all black?

2. General gearing? I will be doing some bashing with it. I'm running 4s @14.8v and have max mulcher tires with 19" Diameter. Is 20p/54spur OK ?

Any help is appreciated