Hi,<br />I have access to many used marine tachs for my boat. The motor and control box are orig 1975 units. I know I have seen a spare grey wire in the control box. I have no idea if it is connected at the motor end.<br />Is there anyone that can tell me how a tach gets wired into this system or if it is even feasible. I assume it all gets wired back to the control box (throttle and ignition switch location) and doesn't have to go all the way to the motor. If the grey wire is not hooked up to the motor where should it go? (point on the power pack)<br />Any help to this "greenhorn" would be appreciated.