dx8 transmitter

This is DX8 remote that works perfect, I just do not need it as I recently switched to a Jumper remote. I am looking to move this now for $120 with free shipping in the USA.

Help! Working on a MAC computer with AP 2.015. Have the Pixhawk system with GPS and a Spektrum DX8 radio. Can't get the Accelerometers to calibrate to save my life. Fails every time. Must be something simple, but I can't seem to figure it out. Can anyone make some suggestions. Thanks, Drew