I just purchased a boat that has a hummingbird fish finder but it is not installed yet on the boat. Can you help me with info about the installation as well as the wires/cables that I need to install this unit. The only thing that I have found is the head and the sonar that is attached to the boat. I would like to use this finder but until I can find what I need to install it with, I'm dead in the water so to speak.