This is a topic that has been covered many times before. If you use the well known ACT gyro (2 versions) you connect the elevon servos to the Gyro and plug the output cables into the receiver. The unit is oriented to give the correct corrections for the axis you want, in this case ailerons. The ony changes made to the flying will be corrections to uncommanded inputs making the flying smoother. The elevon elevator commands are not affected.

Have a look at the manual. The first half is in German the second in English with some diagrams.

http://www.acteurope.com/intanlfuzzypro3.pdf

John