1998 dodge durango Fuel gage

I have a 1998 dodge durango, the fuel gage reads empty sometimes, then when its working fine the temperature gage stops working, I never had both of them working at the same time, and now both are not working, I have checked all my fuses and they all seem fine. Does anyone know what the prblem is?
You might have a problem with the circuit board on the back of the instrumant cluster. Look closely at the connections when you pull the cluster.