What do you use to lubricate a noisy speedometer cable?

I do not recommend grease of any kind and neither does the service manual. I use graphite. It needs to be kept dry, because grease can affect how the speedometer reads by gumming up the cable and making it have resistance.
I was just going to put in a reply saying 'use graphite' but then I read all the previous ones..
Absolutely correct, Rob. Graphite.