The 1602A propulsion monitoring system fits shafts sized from 381 mm to 762 mm [15 in to 30 in] in diameter. The system is enclosed in a strong outer cover and has an electronics readout assembly in a water tight enclosure. These units together provide the means for measuring shaft torque and RPM. Digital readouts are available to display torque, RPM and computed horsepower. Built-in calibration check circuitry can be activated at any time to verify that all local displays and outputs are functional. Enhanced stability and reduced maintenance are the payback for selecting this system. The model 1602A/01 systems can be used in a variety of potential applications including fuel conservation programs, hull and propeller fouling, load and balancing on twin screw vessels, power plant monitors and sea trial torsion meters.