This portable air conditioning charger allows the operator to quickly recharge refrigerant directly from the refrigerant tank into the vehicle's air conditioning system. This time-saving, practical device is controlled by a microprocessor that automatically monitors programmed operations. After the set amount of refrigerant is delivered to the system, the OGD automatically stops to prevent overcharging. Key features of the OGD include an electronic scale for accurate refrigerant quantity assessment, a statistics menu for refrigerant injection, and a vacuum gauge for monitoring the quantities of refrigerant used in the oil injection system.