J.P. Instruments EDM 930 Primary Pilots Guide - Manual (Page 38)

For Your Safe Flight Page 33
Example C: Aircraft has two MAIN tanks.
When you partially refuel, use:
‘Adjust? + 0.0 GAL’: use this to add the amount of fuel you
pumped into the aircraft (it doesn’t matter which tanks
you added to - the EDM totalizes ALL onboard usable
fuel). In this example you will add ‘+ 14.0 GAL’, the
same as your fuel slip reads. This will be added to the
totalizer REM value.
Adjust? + 14.0 GAL