A first light reflecting surface is formed at either the back side of a hub section of a transparent pointer or an hole formed in a transparent dial board and a second light reflecting surface is formed on a front side of the hub section of the pointer. Light rays transmitting entirely within the dial...http://www.google.fr/patents/US4218726?utm_source=gb-gplus-shareBrevet US4218726 - Indicator gauge with illuminated pointer
