> The dimmer function of the headlight switch on my son's '91 Westy failed, taking out all the dash lights.  Does anyone have a new or used one I could buy?  The usual list vendors do not have any available.

I was in pretty much the same situation, so I bought one from Hong Kong
on eBay:
http://www.ebay.com/itm/321044965999?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

It took ~10 days to arrive, and works just fine.  So far.

toodle pip,
--
        Dug Smith         | Terry Pratchett: It's almost
(mailto:dug@dugbert.com) | impossible to ride a rock and roll
(http://www.dugbert.com) | motorbike and stay on for three verses.