I ran the ones I did in my 986 off the 'dome light' running lead down passenger side A-pillar. Worked beautifully; they came on and dimmed in conjunction with 'dome light' and door panel lights. As I recall, there are three contact points in dome light... One is ground, one 'switched', and third controls "door/auto" feature. When you take apart, you'll at first visually reverse the auto/door and the switched functions relative to wire leads until you remember how the switch works to turn on/off. Sorry, only pic is from the actual light I wired up.
Easy and nice mod though - good luck
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