I have mine wired to the cig lighter too. That way it goes on and off with the key. To see how to get to the wires you can look at the Gauge pod install instructions on this page:
While you're there check out my V1 install. I have the remote display imbedded in the dash bezel and the main unit under the passanger headrest. Works really well there and it can't be seen from the outside because of the window tint.