It is a fully microprocessor-based electronic system, enabling to adjust the air/fuel ratio under different engine running conditions, for LPG or traditional NG systems with mixer for vehicles equipped with an oxygen sensor. The control units ensure the right air/gas ratio via the step-motor control – adjusting the gas flow rate from the regulator to the mixer, located on the intake manifold. The system will not require any manual adjustment and is able to automatically adjust to the different environmental and vehicle use conditions.