Where does the factory pick up the water pressure for the wp guage. My hose is curled up and zip tied and not hooked up

there is a brass fitting in the block SB side. They can become clogged with sand & debries very easy & become inoperative.

Mine are on the port side and tee'd into the block drain. Sounds like which ever side they are on it is incorporated into the block drain. I am contemplating moving mine.

Mine to.

Mine 3 I think im going to plumb it off the T stat houseing

Where would you put the sending unit on a closed cooling system?

I drilled and tapped a barbed 90 degree tee on the out side of the seawater pump. Seems to work ok