Minor differences that have gone unnoticed?

JoeD

I am curious to find out some more information on some variance I've seen in some Zs. Perhaps it has something to do with build-date or trim-level, but I've noticed a difference in the tachometers of some cars which have hatches for every 100 RPM, whereas some do not. What's the deal? Yes, I know it's somewhat insignificant, but my curiosity gets the best of me as to why there are two versions. Perhaps there are other minor differences that are not officially mentioned by Nissan between trims and/or build-dates?

Also, there is no documentation that I could find on the difference between the Base and nav-equipped Touring climate-control layout. The Base has the very traditional three-dial layout while the Touring w/ nav's is somewhat integrated into the Bose as one unit. Is it dual-zone climate when you equip nav?

Silly questions, yes...but I'm a stickler on details.