Welcome to JustAnswer, my name is XXXXX XXXXX X'm here to help get your problem resolved. Ask follow up questions, thanks.
If these problems are relatedl then your instrument cluster needs to be replaced......But you could also have seperate issues scuh as alternator, fuel level sender, and coolant temp sensor. Press and hold the info up and info off/on button to check diagnostic codes and let me know what they are. Thanks.