I believe the yamaha WR-250 series has a digital bar type tach. I’m not sure about any of the 650s.
Aftermarket tachs are an option for just about every other bike.
Cruisers make do without a tach… given the type of engine in dual sports, you’ll probably think you are torturing it long before it reaches red-line. They aren’t what one would call smooth at high rpm.
All that said, I look at my tach more often than my speedo, so I understand the want for one.