My coil of wire arrived today.
Now I'm actually thinking of adding a separate fuse block under my console just to run my electronics off of.
https://amzn.to/2SLQNxZThen I can run a dedicated wire from the battery to the fuse block, allowing me then to run direct from the fuse block to each fish finder. This would give me a built in fuse for each unit and keep the fish finders on their own dedicated circuit.
Humminbird has also supplied me with a choke that they want me to install at the head of the run, right at the battery, that they say will help eliminate interference. So I will be doing that too.