Realistic (Radio Shack) made VU meters -- the APM 100 and APM 200 (demo clip below).
https://www.youtube.com/watch?v=i64E8gbI-Po
TEAC VU MB-20
https://www.worthpoint.com/worthopedia/vintage-teac-mb-20-meter-bridge-249054297
If you can find them second hand cheaply.
Or you could buy an old cassette deck with VU meters and just run a signal into it.