I am trying to find a working Amp gauge for the LGB Jumbo transformer. My gauge is unresponsive, but I can measure amps from the screw/wire terminals behind the gauge. I have tried Walthers, Massoth,Silvergate (no response). I purchased the transformer on Ebay and originally both gauges were dead. Aersol contact cleaner and low air pressure blew out what looked like rusty partilces on both gauges. Thanks, Dennis
Try an electronics supplier. There will be nothing unique about the gauge you need except its size and range.
Possible sources of replacement gauges are, among others,
http://www.electronicgoldmine.com
or even an automotive ammeter from the likes of Pep Boys.