: The fuel switch uses a 5-LED system where 4 green lights indicate a full tank and a red light signifies empty. Maintenance & Safety Pressure Management
: Functions of the cabin switch, including LED tank read-outs. lpi vialle technical manual top
The Vialle system is a "slave" system, meaning it relies on the vehicle's original ECU (Electronic Control Unit) for timing, while the Vialle ECU manages the fuel pressure and quantity. : The fuel switch uses a 5-LED system