Ok, so ive got my Helix 10 mega si and 998c HD si on the bow now. At the moment theyre sharing the 998s transducer, XHS 9 HDSI 180 T. I just got a mount for the Mega ducer to fit on the trolling motor. Is it possible for the 998c HD si to read the Mega transducer, the XM 9 20 MSI T? Obviously I won't get mega images but can it read 455 and 800khz from that transducer? Thanks.