Chevrolet Repair: 1988 Chevy Silverado Fuel Gadge, chevy silverado, gadge

Question
Hello sir ,my fuel Gadge moves back and forth ,when my tank is low the gadge shows full, I filled the tank up now it is stuck on full. Could it bee a loose wire?Or the back of my dashboard gadge is loose?

Answer
Odds are that the sender in you tank has come loose.  On these older trucks the baffle comes loose from the bottom of the tank and knocks the float off of the sender.  If that is the cas you will need a new tank.  It is unlikely to be your dash board.