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My 2004 Carbed Merc 90 4-stroke finally died. What a fiasco that motor was, but that's another thread.

I replaced it with a 2015 EFI version of the same motor. To keep rigging costs down, I had the dealer use the existing gauge package and tunnel cabling, which Mercury provides an adapter harness for. Someday maybe I'll put in the Smartcraft package, but for now this setup seems to work fine. Minor issue is dealer says there is no hookup for the old water pressure gauge. I know it's not water temp, but it was always a good indication of cooling system performance.

But...on the accessories page for this engine in the Mercury parts catalog is part number 8M0088855 HOSE KIT WTR PRESS at a very reasonable price. The old engine's water pressure sensor was connected to the gauge via a long thin plastic tube, which is still there, disconnected. All I really need (I think) is the sensor for the engine (under the assumption that the new sensor will hook to the old tubing, and on the further assumption that the existing gauge is compatible with this sensor).

Anyone have any idea?