I bought a second monitor at a thrift store last week for $5. A very good deal, as it works great! What I want to use it for is my cockpit instrument view. I have the Mini Panel by WeFly, which works fine, but wondered how hard would it be to make a custom panel of the gauges I want, instead?
If you have an IPad, even a generation one, I found a great FSX app! It's by Remote Flight Apps. remoteflight.net/
I bought the Bundle and saved a few bucks. I got the moving Map HD app, the Cockpit HD, and the Radio HD apps. Bundled I saved $10. ( ITunes app store )
The free server software connects the sim to the IPad by wifi. It was easy to set up.
The apps give me a touch screen radio panel, map or gauge panel. The sim radios change with the touchscreen app. I now have a full fledged touch screen radio panel. Or gauge panel.