No bus means the cluster has lost communication with the PCM.
In TJs there was sometimes an issue where the twisted pair bus wires weren't twisted all the way up to the cluster connector. De-pinning and adding extra twists to the wires could often fix the issue. It could also just be a connection issue with the cluster connector.
If you want to check the wires they are white/black and violet brown going to pins 1 and 2 of the cluster C1 connector.
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