tubular member 152 to advance in the direction of axial force 166 to regulate thrust force or differential pressure between the upstream chamber 162 and the downstream chamber 164 for example thruster 150 may include a pressure switch 172 which may be in fluid communication with the downstream fluid chamber 164 pressure switch 172 in some embodiments may be a pressure limit switch activating at a pressure set point when the fluid in chamber 164 reaches a pre determined set point pressure the pressure switch 172 may actuate upon actuation pressure switch 172 may send an electronic signal to a control mechanism not shown for regulating the flow of fluid into or out of downstream fluid chamber 164 through downstream inlet 174 and outlet 170 thruster 150 may also include a pressure switch 173 which may be in fluid communication with the upstream fluid chamber 162 when the fluid in chamber 162 reaches a pre determined set point pressure the pressure switch 173 may actuate sending an electronic signal to a control mechanism not shown for regulating the flow of fluid into or out of upstream fluid chamber 162 through upstream inlet 168 and upstream outlet 175 by sending a signal to regulate the flow of fluid into and out of upstream fluid chamber 162.