Humminbird ONIX Operating Manual page 213

Change the Fuel Tank Source Assignments
The instructions in this section are optional and allow you to change which fuel tank is assigned as the Tank 1, Tank 2, or Tank 3
source in the control head.
1. Press the HOME key.
2. Select Settings.
3. Select Network.
4. Select Data Sources.
5. Under Fuel Data, select Tank 1, Tank 2, or Tank 3.
6. Turn off Auto-Configure.
7. Select a fuel tank from the list.
213 NMEA 2000 Setup