I bought the lighted T several weeks ago and finally got around to installing it. Looks great! I wrote up the entire project at: http://teslatap.com/modifications/lighted-t-installation-instructions/
By design, mine stays on all the time at a low brightness (shown above), and automatically goes to high brightness when the headlines turn on. The power required for low brightness is an insignificant 5 mA. If the 12 V battery was not used for anything else, and not charged from the main battery, it would power the lighted T for over half a year (ignoring internal battery losses).
There are other ways to control when the lighted T is on, which I explain in the instructions. In all, a nice addition to my MS!
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