And so if the volts/hz are there then I assume its a blown capacitor or something in the cluster and possibly replace that and if not do I look for a ground speed sensor wire or?

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1987 300SDL 257K

Sounds like a good plan to me.

1. Verify 12V/ground at speedometer pod 6/8 pin connector
2. Verify Volts/Hz for speed signal presence.

If 1 returns failure, then track down why you've got no power to the pod.

If 1 is ok and 2 fails, then track the wire down and see if you've got a disconnect or break.

If 1 and 2 are both good, then its probably in the cluster itself.

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