G3X and aux tanks

I've installed aux tanks in the RV-10 as part of the upgrade (basically like the SafeAir / hotel whiskey tanks).

They have 7.5 gal each per side, but no fuel senders.

How do those of you with the G3X and aux tanks handle this fuel data?

I'm wondering if there is a good way to account for it in the EFIS.

Thanks

When you calibrate the fuel flow sensor there is an option for a ?partial fill?. Make that one your normal fill and the full fuel one 15 gallons more.
You will then have 2 options when resetting after fueling.