Don, did I read something you said about having to add a water pressure sending unit to a new 4 stroke 150 Pro XS? I ordered this motor for a Triton TR186 and I have a SC1000 smart craft gauge (the small square one) as well as an analog water psi gauge now. Will I get all the info on the smart gauge from the new engine that I'm getting from the Optimax 150hp that I'm replacing or must I add sending units to this new motor? Thanks for any info you can give.