Honda CB1100CA 2017 Owner's Manual page 24

Instruments
Speedometer
This shows your speed in kilometer per
hour (km/h) and/or miles per hour
(mph) depending on vehicle type.
20
Tachometer
NOTICE
Do not operate the engine in
the tachometer red zone.
Excessive engine speed can
adversely affect engine life.
Tachometer red zone
(excessive engine rpm range)