It depends on where the needle sits at dead warm idle with a/c off as to what the first mark means. There may be a curve built in there. For me at least any tach not showing engine speeds under 1000 rpm is a paperweight, it is as bad as not having a tach at all. A tach gets used in uncounted number of things down low, you use it to determine if car is idling correctly and if trans is loading correctly if it has a converter. Emissions output varies wildly with idle rpm too, it can make you or break you off even 200 rpm.
Is the one picced at idle?
It could be more dumbing down of the collective car owner mind, if they cannot say exactly what rpm the car is idling at then harder for new owners to come up and complain about the engine not idling right, it would save a BUNCH in warranty costs and Nissan does silly things like that.