GRT Avionics

I am using capacitive fuel level sensors from westach. I've set the sf to 100, offset-off. With the tank full, and the voltage output of the sender at max,(5v) I get 20 gals.

How do I get my actual talk total of 23 gals?
Set the sf up, or will that change how the gauge scales from Empty - Full?

I understand changing the SF to half depending on what you want the total fuel to display. 100 for 20 gallons. What do you do if your tanks totals 23 gallons? Push the SF above? The capacitive sender output is at 5v full now.

I read that the BlueTooth capability would be increased from just the primary PFD info. The ability to see the moving map would be a fantastic addition. When and what will the next upgrades be?