Here's a guy who did it to his Guzzi, looks like a solid idea. There are some sharp folks in the Guzzi world, we modify our bikes more as a hobby than necessity.
http://www.thisoldtractor.com/gtbend...ing_lights.htm
Greg's a good guy, as is Dan Prunuske if you should decide to order relays from him.
Dig in!!!
Milo