Yep, what Snap said is all correct.
The A4 8K & A5 8T have a G266 sensor - a combined oil level and temp sender - wired to the engine ECU. These values are sent via CAN and read by the control head.
The D3 has a simple oil pressure switch wired to the instrument cluster.
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Matt
2004 A8 3.7q, 1998 A4 2.8q, 1994 Coupe 2.8q SORN,
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