David, that is my panel. I don't have the manual. What does it say about adjusting the brightness and contrast?
Here’s a copy/paste of that part. I’ll try to upload the full PDF when I’m at my computer later.
3.4. Settings menus
The display unit has a SETTINGS menu allowing the following settings to be adjusted. To access the settings menu, press
and hold for more than 2 sec. any of the 3 function keys, except the WATER key when the metered fresh water level is
displayed.
BATTERY ALARMS
? Turns on/off the 3 audible battery alarms (default: ON at power up). Press briefly the VOLT key to toggle the battery alarm
ON/OFF. In this case, any previously acknowledged alarm is triggered anew and should be acknowledged again.
? After 5 sec. of inactivity, the display returns automatically to the DEFAULT display.
CONTRAST
? Adjusts the display contrast. Press briefly the WATER key to cycle up the value. When the maximum value is reached, the
next press returns the display to the minimum value.
? After 5 sec. of inactivity, the display returns automatically to the DEFAULT display.
BRIGHTNESS
? Adjusts the display brightness. Press briefly the FUEL key to cycle up the value. When the maximum value is reached, the
next press returns the display to the minimum value.
? After 5 sec. of inactivity, the display returns automatically to the DEFAULT display.