I'm not sure if that module was standard equipment. It's located under the battery... (of all places!) Having said that it's probably easier to wire in a generic system.
The wiring can be found in Del's D3 Tech Dump, item 2 Current flow 
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Matt
2004 A8 3.7q, 1998 A4 2.8q, 1994 Coupe 2.8q SORN,
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