I have never done angel eyes on the X, but I have done it in different cars. There should be 3 wires on the blinker, 1 ground and 2 others. pick ground and the one that is not used to turning or emergency blink, that is on when you turned the key on and stay on when engine is running. you have to test it first otherwise it will blink when you have your blinker on.

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2002 X5 3.0 Siena Red
Premium, Cold Weather, Rear Climate Packages, 19" Wheels
Aluminum Running Boards, Clear Tail Lights, Clear Side Markers
Titanium Kidney Grills, Titanium Trunk Lid, Xenon Headlights
4.6is X5 exhausts, 35% Tint, Aluminum Pedals
2005 530I Mystic Blue
Premium Package, Sport Package, Xenon Headlights
18" Sport Wheels, 35% Tint all around
Mods to come: M-Tech Front Bumper, M5 Side Skirts, M5 Rear Bumper
Quad Exhausts, Style 172 19" Wheels