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Depends where u mount the gauge - if the A-pillar then the wires at the back of the fog light switch are close by and relatively easy to get to.
Edited to say - whoops, i replied without reading the full details of your post, still the fog light illumination wires are convenient, not sure if they are on the dimmer tho.
Rich
[Edited by Richard Curtis - 7/23/2002 11:42:48 PM]