Take the connector off the DME and test the continuity of the speed and reference sensor from there. The 944 manuals that DR links to in his signature have all the diagrams and pin outs your need. By ohming out from the DME connector, you'll know if the wiring is the issue or not.
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Chris M
1985 911 Carrera with a couple cosmetic only mods
2006 E90 330i
1999 E46 328i
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