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What year is your F150?
Thank you. Check fuses #2 and #29 in the dash fuse box. They should be 5 amp fuses. Make sure they are good and please let me know what you find.
Then the problem is the instrument cluster itself and will need to be replaced. Since the two fuses for the cluster is good, the problem is internal inside the cluster. There are no serviceable parts in the cluster and it needs to be replaced as an assembly.