I have a 4yr old MinnKota 74 with the built in Universal Sonar transducer. The Lowrance X75 currently installed is behaving erratically and I am considering replacing it with an Eagle FishMark 480. Is this unit compatible with the existing transducer? If so, will the existing transducer give the same performance as the one that comes with the 480? Also, the connectors on the back of the 480 seem to be different than the ones on the X-75. Where can I get the required adaptor?
I am also toying with the idea of a Humminbird in that location but was wondering if I would have to switch transducers to utilize the dual beam feature? If so, can another transducer be made to fit in the existing Universal Sonar mounting?

Thanks,

Mark