I recently purchased a Helix 9 which I love. I tried to sell my 998 but no takers. Desided to install my 998 on the console and run it on maps only. I purchased an adaptor to c onnct my 9 to my 848 on the front. now I think that I want to have all three units connected. Can I do this and if so what do I need to connect.

Anther question, what would you call t he black plate that covers wires going thru fiberglass. Where can I find two.