you can wire a 4 jaw meter for 120 by lifting that little clip on the back of
the meter and using the left side top for line and left bottom for load, but i
think you need to do a high resistance neutral attached to the screw that holds
the jumper.
you might want to look through old grid tied battery backup stuff for this
because there are a lot of 120 inverters in that genre, the installers of
which, may have had to sort out a performance meter for.
you could get 2 auto transformers and use a regular performance meter in a
socket to keep things simple but overdone.
nick
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