I have a tzt3 and tzt2 and each of the MFD has its own transducer. Tzt3 has a transducer 526TID-LTD and the Tzt has a P66 transducer. I have noticed that when the transducer set up is done in one of the MFD, the other changes its setting. In the sensor list I setup stb and port preferences of each MFD. How do I prevent this set up change it?