Finally got a break in the weather and brought the baby bug home today (pictures will follow soon). I have a quick question, I have 2 depth/fish finders and see the transducer on the trolling motor for the front one but I have no transducer on the back of the boat. There is a wire and a small brass plate in the back but no transducer??? Is it a thru hull mount for the dash unit mounted somewhere else? If so what's the small brass plate mounted back there.....temperature? Thanks for the help.