2018 Ranger Tugs R23 6YC tank calibration override?

[wkanaby]

I had to replace the 6YC Yamaha display / control unit on our 2018 Ranger Tug R23 (outboard). Because it is a new unit, I need to do an initial set-up, however, in order to calibrate the gas tank levels, it wants me to start with an empty tank and as gas is added at 15 gal intervals, it is set each time. I cannot empty my tank to do this. Is there another way of accomplishing the same?
Combo #5 on the display does show the tank level in multiple bars and shows when fuel is consumed, but the Garmin shows zero gallons remaining no matter the actual tank level. The other combo screens on the 6YC do not show the fuel levels.

 

[Jared Dunning]

You can pull the sending unit from the fuel tank and do your calibration from there. It takes two people to do, but it can be done. Just mark a flat surface with 15-gallon intervals to use as a reference.