I've heard about switching out some connectors, but can't seem to figure out which ones and can't seem to find a diagram out there that is much help. Does anyone know which connectors I should switch to achieve this?
This answer clearly describes that you need to switch pins 1 and 2. It also describes that the MKS board is similar to a RAMPS board.
First thing to look for is the layout of the AUX2 header:
The pin layout reveals that pin 1 is VCC and pin 2 is GND. These need to be switched to be able to connect the display on AUX2.