My boat has more wires doing the wrong thing than correct. I have been slowly fixing things for years now. My tachometer, fuel gauge, and temp gauge do not work properly. the tach is correct at idle then goes down to zero as you accelerate. the fuel gauge will not give any reading until there is about 10 gallons of gas in the boat. the temp sensor just doesn't do anything. Could someone please get me a diagram of what the circuits for these should look like. I also noticed that there are two small, maybe 20 gauge,wires coming out of my motor that are not connected to anything. one is black and the other yellow. could these be related to my problems? Thanks for any help i can get.