Honda CBR150R 2018 Owner's Manual page 18

Instruments
SEL button
Display Check
When the ignition switch is turned on, all the mode and digital segments will
show. If any part of these displays does not come on when it should, have your
dealer check for problems.
14
Tachometer
NOTICE
Do not operate the engine in the tachometer red zone.
Excessive engine speed can adversely affect engine life.
SET button
Tachometer red zone
(excessive engine rpm range)