So far no one has figured out how to bypass the sensor. As for the ground issue, just make sure to use no sealant on the threads. Also since the sensor is mounted on the power steering cooler, make sure the bolts holding it to the engine are tight and the cooler does not move any.
Low pressure can also be from anything clogging up the channels, this is from the drive, thru the pump and out. My first thought is the seawater pump. Even though the impeller has been changed those pumps have issues with sucking air if the wear plates are not in good shape. You could get a piece of 1 1/4 clear hose and put it inline to see if anything is showing up
I tried the ground on the sensor. No luck. Next step is it clean all lines Only thing left to do I guess. Already changed the pump housing. Did not look at the mating surface though. The pump housing looked good but changed it anyway just need to fix this issue. Is clear plastic hose safe to run? I?ll change all of it