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Have you considered a single VM with a rotary select switch?Bought a digital VM to mount/test, replacing the analog gauge.. Handles up to 120V, and was only a couple bucks.... Will be buying a couple more so I will have a VM for Batt/Gen 1, Batt/Gen2, and 24V 1+2, so I'll know the charging status of each battery/alt. Haven't perm mounted yet, but testing well....
http://a.co/52tb1dK
Most of the other VMs I saw were either too large, or stopped @30V, which leaves no room for margin if an alternator is overcharging/overvolt....