One of our Goodwood friends is selling this on ebay if anyone needs one.

http://www.ebay.co.uk/itm/Miller-Ammeter-Red-Spot-Vincent-Norton-Truimph-BSA-Matchless-Original-Rare-/251154514557?pt=UK_Motorcycle_Parts&hash=item3a79f9c27d#ht_500wt_1203

Ron

email (option): ronpier@talk21.com