I believe this is the stuff referred to earlier:
http://valkyrieriders.com/shoptalk/CruiseControl.htmIf I can get posting this link to work, you'll find a whole mess of info on the cruise control options and links off of it to follow up on them. Have kept the tank nearly empty for the past week and I've got one of the Audiovox units sitting just out of arm's reach as I type this; waiting for a Pingel aftermarket fuel valve (I previewed the post and it came up censored on half the normal name for the part formerly known as a pet___???) to get here before starting installation (figuring on killing two birds w. one stone, as long's the tank is off the bike).
I paid about $100, including sales tax, at one of our local AutoZones for the cruise control, about another $10 on PVC pipe, fittings, glue, etc to make a vacuum reservoir and I'm sure there'll be anyway $20 or so in odds and ends that'll turn out necessary as the installation goes along.