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If the speedometer and gas gauge issue started to occur at the same time but the vehicle runs and operates properly I don't suspect this is any sensor issue here causing this fault as this sounds more like a fault with the instrument cluster board itself needing removed and repaired or replaced.I have seen the instrument clusters fail or act up in the past before needing repaired or replaced for issues like this here.I would have this tested further to see if this is the cause for sure here and then corrected from there.