I have a Yamaha f50 2007 outboard and my problem is the digital tach is draining my battery when sitting in the garage with the key off, I know the cause is from the hour meter which has power to it all the time but do not know which color wire it is feeding the hourmeter, I would like to put a switch in this circuit to turn it off, I know I can put a battery selector switch in but am limited on space, anyone know what color of wire this is?