Abstract: An interactive service gauge system for servicing an air conditioning system. The system includes a sending unit configured to releasably couple to the air conditioning system. The sending unit includes a sensor configured to generate an electrical signal representative of the performance of the air conditioning system and a control board configured to receive the electrical signal from the sensor and wirelessly transmit electrical signal data to a handheld electronic device. The handheld electronic device is configured to wirelessly receive the electrical signal data from the control board and analyze the electrical signal data to generate and display performance data of the air conditioning system. The performance data is then optionally wirelessly transmitted to a third party for remote storage, analysis, and observation.