Indexing ring providing automatic continuity

An indexing ring for indexing an operator interface device having a conductive housing with respect to a support panel constructed of conductive material with an insulative protective coating through which the interface device housing is installed, said indexing ring comprising:

• a body having two generally parallel flat sides, said body defining a generally circular aperture sized to slidingly receive a barrel portion of the operator interface device;
• an indexing key extending outwardly from and generally perpendicular to one of said generally flat sides, said indexing key dimensioned to be slidably received within an indexing slot associated with a generally circular aperture defined by the support panel and dimensioned to slidably receive the barrel portion of the operator interface device, said indexing key further including an extended portion which extends into said generally circular aperture of said indexing ring, said extended portion being dimensioned to be slidably received within an indexing slot defined in the barrel portion of the operator interface device;
• at least one continuity rib extending outwardly from said indexing key along a longitudinal axis of said indexing key, said at least one continuity rib defining a relatively sharp distal edge, said continuity rib extending sufficiently outward from said indexing key such that said relatively sharp distal edge is cuttingly received within the indexing slot of the support panel thereby penetrating any protective coating applied to the support panel and establishing and maintaining electrical continuity between said indexing ring and the support panel.