Just bought a 2016 Sabre with a 150 Merc 4-stroke. Gauge was showing over 30# of pressure (on 0-30lb gauge) at WOT. Replaced the gauge with a new "Marpac" gauge AND line and the new gauge is reading identical to the old one. The engine has never overheated. Does anyone know what the water pressure should run on this engine. Has anyone ever had HIGH pressure like this?
I just happened to see this thread to the top and realized that we didn’t report the results of our findings. End result was that the water pressure was more than the 30# gauge. It was replaced with a 50# gauge and all is well.
