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On Porsche's the tach signal (TN signal) is always purple with a black stripe. You can pick it up at the cluster or at the DME. On your 2000 I believe it is the white plug pin 15 on the cluster and on the DME it should be plug IV #17. You can pick the vehicle speed up at the cluster as well (white plug #16, wht/brn wire). It comes from the ABS computer via the abs sensors wire. It can also be picked up at the DME via the wht/brn wire on plug IV #22.
The speedometer A signal is for things like the speed dependent volume on the radio.
Todd
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Current Cars:
1989 911 Targa
1984 944 Original Owner
1971 911T
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