I know the Gemini II has an on-board mag sensor and includes a button switch. My question is can you use a mag sensor connected to it as well for on/off function? I already have a Mag Sensor installed in the plane, I am removing a PB battery backer and I'm switching to the Gemini instead. It would help me keep the Mag Sensor in the current location and make it easy to simply add the Gemini. Thanks in advance.