Hooking up a Phat DAC for my Pi Boy Zero

I am working on setting up a portable gaming system using a pi zero in a gameboy DMG case. I have no headers installed to help with space and I have 2 questions. First is if I connect pins 18/Physical pin 12, 19/Physical pin 35, 21/Physical pin 40, GND/Physical pin 34 and physical pins 1,2,4 for 5 and 3.3V will that be all i need and will sharing the power pins between The pi, DAC, and a 3.2in tft cause any issues. Second question has any one used the single line installer with Retropie and if so where there any issues? thank you in advance for any advice.