This site is being deprecated.
Please see the official X‑Plane Support page for help.
There are some of the requirements and equipment needed to set up a three monitor display. You need three monitors capable of the same resolutions and having a DVI port and display port and also a video card that will support at least three monitors with multi-monitor software or a video card with two DVI ports and a display port or two video cards with a total of those ports. You can read more here.
This site is no longer being actively maintained.