Does anyone know of a gauge that links to the autopilot to make the a/c follow a constant orbit over an area? even a gauge that made the autopilot follow a pattern that could be looped?

If no one knows of one then could someone make one?

I was wondering because i try to fly awacs a/c in a somewhat realistic pattern and it would help to have a gauge. it would also be good for something like an AC-130. Speaking of which, is there an effects package that simulates and AC-130's firing?

I'm sure you don't have to use the whole panel.  There's probably a specific and invisible gauge that does what you're asking, or a certain set of gauges that function together.  You could most likely contact the author that made it and ask which ones.  Often times, a designer is willing to modify their creation a bit to suit other needs, and then post it for everyone.