I guess you have a K75 (I have a psychic gift!)...it is useful to add your bike details (year/model etc.) in your signature block to allow other members to provide more precise advice. Bike photos are well received too.
I can't help you with your question...but someone out there will have the knowledge. Good luck.
The speedo healer will do the job but you must get the right one for a K100 as they aren't the same as for the great majority of the Japanese bikes. They are often used to change the speed limiter on some bikes.
__________________________________________________ "Man sacrifices his health in order to make money. Then he sacrifices money to recuperate his health. And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived." Dalai Lama