Hello all. I have a 75 hp Johnson outboard (2 stroke) from the 70's that apparently does not have a telltale. The manual indicates a "steam" that is supposed to come out but I dont see where or how that will help me at speed. The engine runs fine and does not overheat, but a stream of water would be alot more reassuring. Ive heard of adding one but not sure how thats done. Anyone done this before?