SW Shelby 'Alternator' Gauge
 

Hi all,

I bought an old set of gauges with what looks to be a Shelby-esque Alternator gauge. Can someone please tell me if this is a correct Shelby gauge and what it might be worth? I would trade it plus cash for an 'Amperes' gauge with the same patina.

Thanks,
Tony

http://tonyn.smugmug.com/Other/Parts..._gauge_1-L.jpg
http://tonyn.smugmug.com/Other/Parts...gauge_3-X2.jpg