Electrical problems

Hello dear forum members, I urgently need your help with an electrical problem. Vehicle: V70 Built. 1997 Gasoline Since yesterday my tank indicator and my rev indicator suddenly stop working. The service interval light flashes continuously. The onboard computer only displays time and outside temperature – switching to other information is not possible. The speedometer and the engine temperature indicator work. The engine runs flawlessly. Does any of you know these symptoms? Would be nice of you if you could help. BonoK