For a cost of about $40 you can build a budget VR headset for FSX.
Here's what you need. The resolution is not a good as a monitor, but it is fun to try.
An Android smartphone 4.7 to 6 inches. The bigger the better. I am using an old 6 inch phone with no service as long as you have WiFi your good.
There are a lot of VR Google Cardboard headsets to choose from. This is the one I bought http://www.amazon.com/gp/product/B015K8DM9M?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00
TrinusVR app for the phone and PC (free Demo $7 to buy) http://trinusvr.com/
FacetrackNOIR (You do not need the camera) http://facetracknoir.sourceforge.net/home/default.htm
Here is a helpful video
[youtube]http://www.youtube.com/watch?v=VrXOXvsgQzg[/youtube]