Abstract: Devices and methods for obtaining diagnostics and control of the pumping process of rod pumped oil or gas wells are described. The diagnostics and control are implemented by means of the well simulation unit where surface load values are gathered through utilization of a load cell mounted on the carrier bar and attaching to the top of the polished rod and surface position values are gathered through the use of a position sensor mounted on the polish rod. Subsequently, an animation representing the entire pumping system is displayed instantaneously either on local display or by utilizing a HMI or a portable laptop, computer or other device connected to SCADA system. Changes of well conditions and pumping system conditions are displayed real time utilizing a direct simulation.