How do you set the Diesel Module QFL226 watch to 12 hour mode instead of 24 hours?

To set the Diesel Module QFL226 watch to 12-hour mode, first press and hold the "Mode" button until the time starts flashing. Use the "Adjust" button to cycle through the settings until you reach the hour format option. Select 12-hour mode, then confirm your choice by pressing the "Mode" button again. Finally, adjust the time as needed and exit the setting mode.