I have just purchases a brand new 40 Hp 2 Stroke (2002) Merc.out of the box. I am in the process,time allowing to break it in, I have about 1.5 hrs on motor. My motor came with the wiring for a engine alarm hookup but my controls dosn't have an alarm on it. Is it possible to hook up a external alarm on this engine? If possible where can I purchase one, and how would I hook it up? Thier is one spare wire coming from harness by the controls it is a browny grey colour??