After upgrading my aluminum fishing boat's console mounted 597ci di hd with XNT-9-20-T transducer to a 998hd si with the XHS-9-HDSI-180-T transducer, I am hoping there are off-the-shelf cables and unit configurations to accomplish the following:
Both transducers are transom mounted one to either side of my outboard.  As mentioned, the 998 is mid-hull in the console.  I want to mount the 597 on my stern rod rack where I will use 2d and di while controlled drifting on the river.  I'd like to cable so that the 998 is using the HDSI transducer for si/di, but is using the XNT transducer for 2D sonar/depth reading while running at speed.  It would also be great if I could leave both units running without having to power down one or the other to avoid interference.
So, summary is  HDSI transducer to 998 for si/di,  XNT transducer to 998 for 2d/depth and to 597 for 2d/di  all at the same time.  Possible?  which cables/wiring?
Thanks in advance.