Went to a Ford dealer, they instantly told me that the instrument cluster had to be replaced. Cost: $2,000 (with the installation service). Of course, didn't say yes. Then drove downtown to a shop called (in Spanish) "Instrument Cluster Clinic". The first day they found a couple of bad solder joints on the Panel Circuit Board. Repaired them but the panel cluster was still malfunctioning. After two more days of testings, they finally tried replacing what they called a "voltage regulator" to the instrument panel. Bingo! Total cost: $150 (with 6 months warranty).

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Case closed. Thanks to everyone.