The model MD23 series FLEX Custom Function Display (“CFD”) is a panel-mounted instrument capable of displaying various inputs in a configurable graphical presentation. FLEX is an off-the-shelf solution that is FAA and EASA TSO-approved with Level A design assurance software certification. The power of FLEX is its ability to become exactly what your application requires without the time and cost of a product development and certification effort. This unique new breakthrough in avionics uses a Patent Pending software concept that allows it to be quickly customized to your requirements by Mid-Continent Instruments and Avionics without re-certification. With the ability to receive and send multiple types of inputs and outputs, allow user interface, and display custom designed graphics, FLEX is as flexible as it gets.