I currently have a hummingbird 858 DI unit on my bow and a 898 SI unit at my console, i want to purchase a 999 unit to put at my console and put both the 858 and 898 on the bow. I know if you put two transducers close to each other they will cross talk without enough difference in frequency. Is there a way to run both side imaging units off of one trancducer, i have both of mine linked right now with ethernet cables. I just bought the boat and when it comes to wiring fish finders and transducer placement and linking the units i am lost.