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Generally it has been my experience that the engine fittings for the water pressure gauge come as part of the Water Pressure analog Gauge package, which is why water pressure gauges tend to cost more. You have to buy a Mercury gauge to get the correct compression fittings for the small bore plastic tubing. Teleflex gauges use larger rubber speedometer type tubing that doesn't work as well.

In your case, you (or your trade-in dealer) should have taken the fittings off the old engine, and replugged the hole. Do you still have access to the 2004 engine? if so, rescue those, and soak them in "Limeaway" to clean them up before re-installing in the new engine.