I hooked one of those up on my 929. I use it to power my XM radio when I'm on trips. It's also good for powering a GPS or charging your cell phone while on the road. Hadn't thought about a coffee pot...hmmm!! I got the socket at Radio Shack. Autocom sells a wire with a pig tail on it that plugs into one of the plugs under the seat, then I wired the positive end of the power plug to that. The negative wire goes on the negative battery terminal. I have the socket stashed under the rear seat. If you don't get the Autocom plug, just find a wire that has power that gets turned off when you turn off the key. I originally had it wired to the license plate light wire, but that wire was too thin to hold a good connection, so I got the Autocom plug.
If you need pics, let me know. I won't be able to get them posted for a week or so, as I'm heading for Grattan.