Seems Mercruiser changed the location of this sender location from the early say 2003 located on the actual seapump to the new location of the power steering cooler(back of the engine).

My port engine pressure was reading 42 psi just with key on.

I have twins so I swapped the stbd over to the port . All seems good now.
So I have to order a sensor. I said heck I'll order 2(cant be more than $20.00 each) . I look here and its 81.00 big ones per sensor!!!!!
http://www.marinepartsplus.com/catal...0#8818793_jump

Item #29

Is there another place to order for a better price??

Thanks