I mounted dual gn3 12’s on my dash. One is si and the other is di. I plan on running the si unit just for si and the DI unit for DI and mapping. My question is how can I do this with one transducer or do I need to mount both transducers? I’m also running a gn2 10 upfront how should I link that with my units? Black box or or just to my mapping unit?