Rick_Banshee
New member
Hello everyone, I'm new here and have a question regarding a PSI gauge on the dash of the used boat I recently picked up. The engine I am going to use is a 1975 Mercury 650 3 Cylinder. The gauge has a long thin nylon hose reaching back to the transom and I guess was connected to the cooling system of the engine that was on the boat before I got it. Where would I connect this line on my 1975 650?