Sorry, I guess my response wasn't clear either! :)
At this time, X-Plane only supports two views on two monitors on the same computer. If you enable the Instructor Operating System (IOS) in the rendering options screen, you can see the map screen on the main monitor (that's the IOS). For the second monitor, you can change the view to only one of the radio buttons in the rendering options screen: forward with scenery only, forward with HUD, forward with panel, forward with 3D cockpit.
These are the only options for a single computer, multi-monitor set up. As far as I know there is no software that will over come this limitation of the sim.
Using the IOS may be a reasonable compromise for viewing/controlling instruments. You can check the "inst" box at the top of the map/IOS screen and it will show the instruments. Then set the second monitor to the view you'd prefer.