At present I'm using a shunt attached to engine sensor wires 24 and 25 to sense total alternator output. In the latest Vertical Power VPX Pro manual, Marc states in section 3.7:

"The EFIS displays a VP-X page which shows individual device current
as well as total current through the VP-X. The EFIS also has an ‘Amps’
gauge that is used to show the readings from the shunt. In some cases the
EFIS ‘Amps’ gauge can be used to display total system current from the
VP-X. Please check with your EFIS manufacturer for details."

How can the amp gauge be configured to show total system amps from the VPX?