Fuel and speedometer not working
 

Volvo 850 awd 1996 whats the problem when my fuel and speedometer wont work even tho both fuel level sensor work same with the speed sensors and the cables from the rear to the instrument cluster are fine also the cluster is working as it should just wont show fuel and speed and also my 0-refuel is stuck on 700km? Anyone havd idea what could be wrong?