Put a voltmeter on it and don't reconnect your battery until everything reads correctly, otherwise you might fry something.
F post or post connected to sender/tank
E post or post connected to ignition
Post to post resistance reading 29 ohms
F post to ground or outside of housing
27 ohms
E post to ground or outside of housing
57 ohms
Check for burnt or broken wires. Central rivet if loose can cause problem with the ground. Also need connectivity from housing to dash
