I picked up a used 2004 Yamaha FX Cruiser. While playing with the instrument panel, I switched the display from MPH to KPH. How do I switch this back?

There is only one button, so it should be easy enough. If I tap the button when it is running, I can switch from volts to hours. I have tried holding the button, etc. Ski on, ski off. If I hold it really long, I get a 01.

What am I doing wrong?

Phillip Lawrence