my 9.9 is runing 350 rpm over redline i wanted to install a tachometer to make sure im not going over i am aware tat thereare some that connect to the sparkplug wire does anyone know what these are called
i have a 2002 mercury 9.9 2-stroke i know there is a way to convert it to 15 hp. The was an article in bass and walleye boat magazine that discribed the whole thing but i have since lost it. i know the two major parts are carborator and exhaust tube and in the article they used boyson power...