Projecta do a 2 in 1 unit to monitor a dual batt kit volt / amp but not sure on measuring any juice left, from memory around the $100 mark. Baintech do a 2 in as well.
I will be looking at some cheap basic LED volt meters when I finish doing (rewiring) the previous owners d/b set up, will look at putting in a push button to activate the display and possibly put in a surge / spike protector as well.
Projecta Monitor
http://www.ebay.com.au/itm/PROJECTA-...item337baa83c5
Projecta Surge Protector
http://www.ebay.com.au/itm/PROJECTA-...item41698cd90d
Baintech Versions
http://www.ebay.com.au/itm/BAINTECH-...item416574c5bb
http://www.ebay.com.au/itm/BAINTECH-...item41657511b0
http://www.ebay.com.au/itm/BAINTECH-...item3a734f1f81
Or the whole hog for $450
http://www.ebay.com.au/itm/VITRON-BM...item415e1d5172
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