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malfunctions frequently,but always works ok when taken to repair station. This is both speedo and tach. Repair station recommends replacing module.
This is very common on the 03-06 GMs. The cause is the motors behind the gauges are failing, they all go out eventually. You can get it repaired here - www.drspeedometer.com and there's a DIY guide here - www.howtorepairmyinstrumentcluster.com
(Cost of replacement at the dealer is usually $4-700)