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You got to be 100% certain that the 12v DC-DC converter does not share a common ground (they often do) and allows full electrical isolation between both sides beyond 200 Volt.
I killed one Volt meter by feeding it from the car battery while measuring my pack. Turns out it had some common ground.
I now am working on a setup where a 12 Volt powered relay switches the 9 Volt battery in an isolated circuit to my new meters.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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