Another Hello!
I am in between these two guys but lean towards Al (although I have a tach).
My boat did not have a tach and had thousands of hours on it (I know the boat's history), but I added one soon after I acquired it. Like, capnward, some of us like to tweak and tune and the tach can be helpful there...but I agree I probably don't use it daily for every day cruising..I watch water temp and oil pressure more than anything. If I would ever come off the $$ and get the Moyer EDWS, then I could stop being a gauge hawk.