Currently have 80 gallons (74 useable) with CIE floats gauged on the HDX displays. After topping off, hit the 'full' button and everything works fine. NOW - adding tip tanks (another 40 gallons) that have floats and an independent gauge. How does everyone with this configuration set up the HDX capacity & gauging arrangement? Just manually add 40 gallons mid-flight if the tips are full? Can it be set for two different 'full' configurations?