I have gotten a hawk eye depth finder and have started to install it but before I started, I noted the wiring on the old clock. I have located the correct positive and negative wiring but was wondering two things. One was the two blue wires hooked into the bottom terminals of the clock. They look like they link to the fuel gauge as well but not really sure where they end up. The other is there is a red and a black wire that terminates at some kind of grey plug. I did not get a pic of this wire but will add one later. Any advice is greatly appreciated as I am not an electrical person.