Standalone VU Power Meters?

Was thinking it would be nice to add some large, lighted VU type meters to my setup. I see Realistic once had a couple of models, the APM 100 and 200. As far as I can tell, the 100 uses a wall wart to light it, but the 200 has a captive power cord. Does the meter go inline between the amp and speakers? Do you know any other standalone makes/models that may have been available in the good old VU days?