Yes. What you're looking for is called a "linear power supply" and you can either build it or buy it.

If you're going to build it, all you will need are:

- a 120VAC to 7.5 to 10VAC transformer -- to power the meter, you need very little power. Say, 1 amp output at 7.5 volts.

- A "7805" three-terminal power regulator.

- a rectifier bridge

- a 1n4001 switching diode

- some capacitors to provide filtering to the regulator input/output.

And some wire, solder, frame, etc.

Alternatively, you could look at some electrical surplus outfits and find an open-frame linear power supply for, oh, $15 to $30.

How much you want to spend in time and/or money Mike?

Edit: here we go. Brand new, open-frame linear power supplies. The cheapest is 5VDC @ 1.2A. $27.

http://www.mpja.com/viewallpict.asp?dept=26&main=1

Until the input voltage gets to within range, the power supply won't produce anything. Minimum voltage on this supply is the configured input = 13%, for 120VAC, that would be about 105VAC input to see regulated output.