Yep just like the link, one side of your overide to earth , the other side to earth on the relay (switch) usually pin 85.

The diagram in the link uses as permanant live for relay/coil side usually 86(standard wiring) so make sure you have turned your overide off before you walk away or you could end up flattening the battery.
A toggle switch with a light would be a good bet to eliminate this happening or just dont forget like I would haha.