Available on flightsim filename: ifr_guage.zip or search for Andy Niko.
The package contains an in-flight refueling gauge that can be installed on any aircraft and allows refueling in the air from any aircraft - in free flight or multiplayer. Check out the demo video: http://www.youtube.com/watch?v=jwpHynhFKtY
I tried it and its pretty fun. Watch the video and see how it works.
In-Flight Refueling Gauge for FSX
In-Flight Refueling Gauge for FSX
Lead, Follow, or get the Hell out of the way!