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On the J1939 port, you have a signal? Do you mean you have it with a scanner but you can't get the signal to the cluster?
If that is the case, you have a module programming issue or a bad vehicle module that will need to be swapped and programmed. The engine sends the signal through the diagnostic port to the vehicle module, and then to the cluster module. If wither have mismatched software, you don't get the signal. Same as a damaged harness between the two.
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