Beardog,
I have one of the iLevil3 AW devices and am extremenly happy with it. Take a look at their documentation because they have a free WIFI "utility app" that can provide flight and engine information. According to the documentation, the iLevil3 device will accept input from an engine monitor (such as Grand Rapids Techology) and display it to their app.
I am in the midst of attaching (hard wired) the 3AW device to my Trio auto pilot. My plan then is to feed the flight plan from IFLYGPS on my iPad, to the 3AW (via WIFI) and then the 3AW driving the auto pilot.
Hope this helps.
Steve