I just installed the VU meter and made a video of the install. Also listed the parts and links that are needed on my website.
Blog Post :
https://pinballsupernova.wordpress.com/2016/04/28/mod-install-vu-meter-for-metallica-pinball/
Website Post with parts and links.
http://www.pinballsupernova.com/vu%20meter%20mod%20install%20metallica.html
Video :