Whoami is correct, MAS are for the most part piloted via sticks, pedals and buttons, with displays, switches and keys essentially at your lap. However, the main 'display' for a MAS is kind of like the Titan from Titanfall's display screens, in which the walls of the cockpit form the main display. 

There is also a neural link between the MAS and Pilot. The neural link is for monitoring squadron biometrics as well allowing the pilot to control the movement of the MAS's head with his own head, as well as aiding with fine motor control of the unit's hand. This neural link is fairly minor and is only one way, so if your MAS's head gets blown off your brain won't short out with it, you'll just lose the ability to see anything from within your cockpit. 

This is combined with a helmet HUD which provides information such as ammunition counts, personal and squadron biometrics, communications information, incoming feed, etc. Information can be transferred from the helmet to the displays on the MAS via neural link.

Each MAS also has a built in computer AI. AI also aids with fine motor control, and responds to voice commands as well- so instead of having to key open a communication channel manually(which you still can), you can tell the AI to do it for you.