Mercedes-Benz 2008 M-Class Operator's Manual page 169

Controls in detail
Control system
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168
Selecting display (digital speedometer
or outside temperature) for status
indicator
Move the selection marker with
button æ or ç to the
Instrument Cluster submenu.
Press button j or k repeatedly
until the message Status Line
Display appears in the multifunction
display.
The selection marker is on the current
setting.
Press button æ or ç to select
the desired setting.
The selected display is then shown
continuously in the status indicator
(lower display).
The other display now appears in the
menu of the standard display
( page 154):
Digital speedometer
or
Outside temperature