To me, one of the stupidest things ever is to put a tach on a small thumper or two stroke. I have no idea why the Japanese insist on adding one. It isn't exactly a superbike. It doesn't make enough power to hurt itself or you. So it doesn't need a tach.
None of my current thumpers have a tach and only one previous thumper had a tach. Therefore I have no idea what the red line is much less whether I ride at, near or over it. I shift when the power drops off or it quits reving the way God meant for us to ride.
If you are worried about reving a little one lunger, don't. Run it like you stole it. Rebuild the top end when it gets tired. Then run it hard some more. Seriously. Have fun. It is a motorcycle, right?
640E, MXC200, XT200