Hi,
You have certainly noticed that some K0 models have a red light between the speedo and the tachometer.
This light is a "speed warning light" specific to the Japan market. It was due to the Japanese regulation at that time, the speed limit of the motorcycles on the highway was 80km/h. There were no such rules in export countries.
Today the rules have changed and the speed limit of a motorcycle on a highway is the same speed as cars (100 km/h - 60 mph).
(source : japanese site identified by 4pots1969)