I JUST PURCHASED A USED Tahoe FROM A PRIVATE.

I JUST PURCHASED A USED TAHOE FROM A PRIVATE OWNER. WHAT I NOTICED LATER AFTER DRIVING THE VEHICLE RIGHT AFTER LEAVING THE GAS STATION IS WAS THAT THE METER FOR THE GAS FUEL WAS NOT WORKING. IT WAS ON EMPTY AND I HAD JUST FILLED THE GAS TANK. THEN I NOTICE THE METER OF THE BATTERY WAS OFF AND NOT WORKING ASWELL SO WAS THE MILEAGE METER THINGY. I ASKED SOMEONE FOR HELP AND THE ADVISE I GOT WAS TO REMOVE THE POSITIVE FROM THE BATTERY TERMINAL AND WAIT ABOUT A MINUTE OR 2 AND EVERYTHING SHOULD BE WORKING. I DID IT 3 TIMES AND IT STILL NOT WORKING. IM AFRAID TO DRIVE NOW THAT I DONT KNOW THE SPEED LIMIT IM GOING AND KNOWING IF IM LOW ON FUEL. I CALLED THE PERSON WHO I BOUGHT THE VEHICLE FROM AND THEY WONT ANSWER MY CALLS I LEFT NUMEROUS MESSAGES AND STILL NO REPLY. ALSO THEIRS LIKE A CLUCKING NOISE COMMING FROM THE STEERING SHAFT WHEN DRIVING ESSPECIALLY WHEN MAKING TURNS. IM A SINGLE MOM OF 5 CHILDREN, PLEASE HELP ME I DONT KNOW WHAT TO DO. THANK YOU, LYNN OF HAWAII