are you referring to the main car battery? what has been checked beyond the battery?
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the only things that can cause just the cluster not to work are:
a) blown fuseb) bad connection at the cluster or wiring problem to the clusterc) internal cluster failure (requires replacement
if you have not checked your fuses, I suggest you do, and also check the connections at the cluster.
if nothing is found, you unfortunately will need to have a new cluster installed as this would indicate failure. Not terribly uncommon.
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