Some IBM 370's had a big galvanometer on the front,
EG the '168 had one even with the massive CRT
up there on the panel.
(photo courtesy the corestore)
http://www.corestore.org/370168-1.jpg
AIX / RS6000 had a nice set of onscreen meters.
Old fantasy: working Apollo CM control panel with all
the lights, switches and barberpoles.
John A.