Making a 2D Screen on a SEnt

I have no idea what I am looking for but I know what I want to do.

I have a helicopter SEnt and I want to add a screen (possibly RT) to the inside of the cockpit that shows what the camera on the cannon is seeing.

Does anyone know what function I need to use to accomplish this task?

The center of this is where I want to draw the screen:

http://cloud-2.steampowered.com/ugc/921275751305384312/50F6ABB3A8B3F573EE2C855ACDF8055E1D928442/

Is this even possible to do?

You will need a 3D2D camera.