Turn the knurled ring to 
.
The warning light 
on the instrument
cluster will come on.
See also:
Refuelling
To guarantee full tank filling, carry out two refueling operations after the
first click of the fuel delivery gun.
Avoid further topping up operations that could cause damages to the fuel system.
...
Installation of electric / electronic devices
Electric/electronic devices installed after buying the car or in aftermarket
shall bear the and marking:
Fiat Auto S.p.A. authorizes the installation of transceivers provided that installation
...
Dealer Service
Your authorized dealer has the qualified service personnel, special tools, and
equipment to perform all service operations in an expert manner. Service Manuals
are available which include detailed ...