Dashboard Design

As a car enthusiast I have noticed a strange feature
in some cars (mostly European) that pushed me to
write this post. Why do some cars have the
tachometer placed to the right of the speedometer
in the dashboard? Is there a specific
reason/purpose for it? I have seen this in the
Mercedes-Benz S-Class, almost all of BMW’s cars
(if not all of them), and in several manual shift cars. I
am just curious to why some car companies choose
to manufacture their cars that way.

Please be respectful and share constructive
comments.

Thank you in advance.