Hi! Got a 406 exec. 2001. Recently, the fuel gauge has been behaving strange. It started last week. Filled up the tank, went home and everything ok. After a while, got in the car and started up and the gauge indicated that the tank was empty, with the light flashing and a warning message on the display. after a while it started to rise very slowly. Switched off several times until it started to work normal again. Today filled it up again and the gauge played up again. After much switching on and off, now its ok. Could it be the sender unit in the tank or is it the instrument cluster thats playing up? Many thanks to all, in advance. J. Grilo