Compatible with X Plane 11.
Connect your computer running X-Plane and your Android device to the same network.
That's it - no configuration required.
This is the Pro version, which contains the usual "six-pack" of instruments:
Airspeed, artificial horizon, altimeter, turn coordinator, gyro compass, and variometer.
Easy to set up, requires no plugin.
Before paying for the full version, try the X Plane Steam Gauges Free to make sure it is compatible with your device.
Available here: https://play.google.com/store/apps/details?id=com.xplanesteamgauges
Graphics by Sébastien Matton (https://github.com/sebmatton/jQuery-Flight-Indicators) and WikiPedia user Mysid (https://commons.wikimedia.org/wiki/File:Turn_coordinator_-_coordinated.svg)