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Larry, welcome to the Atomic Four world. Yes, definitely get a tachometer. There is a reason why it is often the largest gauge on the boat. I can't imagine not having one, and not knowing the RPM.
A tachometer will help you understand your engine, which is the goal here. Other aids include vacuum gauge and fuel pressure gauge. All these, especially in combination with each other, make it easier to diagnose and avoid problems. The more information you can get, the more interesting your engine becomes. If you like that kind of thing. The expense is easily worth it, IMO. It all leads to peace of mind on the water.
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