J.P. Instruments EDM 930 Primary Pilots Guide - Manual (Page 37)

For Your Safe Flight Page 32
Example B: Aircraft has two MAIN and two AUX tanks.
You’ve preset: ‘MAIN = 60’ (30 + 30 usable)
‘AUX = 14’ (7 + 7 usable)
When you refuel:
‘MAIN 60 GAL’: use this shortcut when filling only MAIN tanks
(! AUX tanks must be empty).
‘MAIN+AUX 74 GAL’: use this shortcut when filling MAIN and
AUX tanks.
(only one wing shown in each of the two scenarios)
MAIN+AUX 74.0 GAL MAIN 60.0 GAL