how can I fix Ford Focus 1.6 si ?

M having the same problem,cluster faulty,rev counter,speedometer,temp gauges are malfunctioning and it doesnt display mileage.it says on the display 'water in fuel,engine systems fault.and it doesnt start da engine at all,the alarm light keeps on flashing and all other warning lights.someone said I should change the cluster but m puzzled,i dnt knw what to do.Please help!