I have a nitro Z7 that I'm taking the lowrance's off for the hummingbirds I took off old boat . I have a HB 998c SI , a HB 858c DI and I'm buying a 3rd HB for the flush mount dash . Also getting Minnkota Terrova trolling motor . Wanted to put the SI on trolling motor , the DI at console and buy the 798 SI for flush mount dash but I guess you can't have the SI on shoot thru hull . I really want to have SI at trolling motor but I need it at dash too . Any suggestions ? Thanks for your time fellas ! Much appreciated ..