If my Benelli stash was not packed away about 180 miles north of my I could be of better help but for now this all I can do. The Dynamo's and compacts came a few different ways alot of time sold as "woods bikes" without lights but benelli offered a pretty complete lighting/speedo kit for them as options. I have at least one left for my bike but its up in the barn so I dont know the part numbers for it. The only parts manual I have here is for my 1972 Hurricane 65, they always came with lights (same as what was in the "kit") though. I scanned that part of the catalog I have here to maybe help you a little.
the switch for the lights is a CEV Benelli part number is cb 1895 this switch is very common, Rupp used them even as well as just about anything small coming out of Italy. Up until recently there was alot of them available new, but that has dried up and usually they are now about $70 new, they are making a reproduction unit though thats about half that ( I dunno the quality) I think the CEV part number is 8052.1
The brake lever switch is kinda of hard to explain, on my first scan though in the top left corner of the second section of parts (just above the the exhaust in the drawing) you see a little triangle with a bunch of small parts. Well that is the "switch" :doah: Basically, it all goes on the brake lever housing and lever, it replaces some parts already there and pretty much just make it a 2 pieces of metal touch to make the Switch. Again If I was up at the other house I could probably show these part loose and on a bike. I am not sure what the dynamo's used (if anything) on the rear/footbrake though. CEV also made pretty much the same throttle assy's with a microswitch built in the the lever arm too though. and you could easily put one of those on too.