Looks like I have a coolant/water pressure sensor that has failed and is reading 0 psi at all times. For some reason this doesn't cause any problems under 1200 rpms.. but above it the engine goes into guardian mode and wont run at high rpm. The water TEMP is a steady 145 - 160 and it's a freshwater cooled engine.. The problem is the repair place it needs to go to today or tomorrow is a MUCH LONGER trip at 1100 rpm vs 4000. Is there any way to tell the computer to ignore this sensor? I imagine this isn't the kind of sensor you can just unplug... because it NEEDS to get some kind of pressure reading.. It's on a 383 stroker FWC mercruiser motor.. thank you for any help!