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I don't think the OMC 70s ever had the pitot in the gearcase. OMC pioneered this idea with their V-4 and V6 motors in 1982. After 1985 they had discovered that it was a great idea that did not work because gearcase pitot would clog the first time you hit any tiny debris on the water. 1986 saw the feature gone.

Other manufacturers, like Mercury, copied the idea and continue to offer it. Both of my Mercury 150s have gearcase pitots. They are worthless in Puget Sound because they will clog the first time you run the boat so I just pitched the speedometer after I bought the boat.

However, if you really do want a pitot speedometer, then mount the pitot tube on the transom (it has a spring loaded kick-up feature to protect it) and run the tubing just as Larry describes. That is how I always did it back in the olden days before GPS.

If anybody wants a transom mount pitot tube and some tubing, I have one in my shop I was thinking about pitching. I have an old speedometer too if anybody want that.