The needle shows the fuel present in the tank. When the fuel reserve warning light A-fig. 35 - 36 comes on (on certain versions with the dedicated message on the reconfigurable multifunction display) it means that there are approximately 5-7 liters of fuel left in the tank.
E - tank empty.
F - tank full.
Never travel with the tank almost empty: lack of fuel could damage the catalyser.

IMPORTANT
The needle will point to E and the reserve warning light A will flash to indicate a fault in the system. Contact a Fiat Dealership to have the system checked.
See also:
Low battery charge
Turning the key to MAR the warning light on the dial turns on, but it should
go out as soon as the engine is started (with the engine running at idle speed a
brief delay in going out is allowed) ...
Vehicle Modifications/Alterations
WARNING!
Any modifications or alterations to this vehicle could seriously affect its
roadworthiness and safety and may lead to an accident resulting in serious injury
or death. ...
Six-Speed Automatic Transmission
The shift lever position display (located in the instrument panel cluster) indicates
the transmission gear range. You must press the brake pedal to move the shift lever
out of the PARK position (R ...


