VY Fuel Gauge Calibration - confusing

I'm trying to fix the calibration of my fuel gauge in HP Tuners. (I'm just learning HP Tuners so am a newbie).

The fuel gauge is working but in reverse (which is a common problem that I believe can be fixed in HP Tuners).

One thing is confusing me, in the tune file I have read from the car under "Fuel Tank/Gauge" the data is all zeros (as shown below), shouldn't there be data in these tables already? ie shouldn't I be able to see the data the fuel gauge is using?

Capacity, 0.0L

Primary Capacity, 0.0L

Sender Max A/D, 0

Sender Min A/D, 0

Gauge Output, table all 0's

Primary Volume, table all 0's

Secondary Volume, table all 0's

The car is a 2004 VY SS Ute, LS1.