provided with a regulated source of 5 0 volts through these transducers the pressure is measured converted to current providing an amperage output that can be processed by the circuitry of this invention a double throw switch as at 8 connects to a battery such as a 9 volt battery 9 as noted the charge is conducted to a regulator 10 to supply the 5 volts needed for the circuit and pressure transducers and simultaneously connects a second battery as at 11 to provide the power for a panel meter 12 that furnishes a display in referring also to fig6 the transducer outputs are conducted through 10 kilo ohm resistors 13 and 14 and conduct their charge to the 100 kilo ohm potentiometer 15 used to zero the measurement when pressures are equal in addition a parallel conductive path is provided including an 80 kilo ohm resistor 16 furnished in series with a 20 kilo ohm potentiometer 17 that is used to adjust the differential signal to a level suitable for display in this case for example a 200 mil volt signature corresponds to 2000 ft pounds of torque with proper calibration and the correct pressure transducers with only slight modification of resistor and potentiometer values the range can be adjusted to allow measurement of lesser or greater pressures in addition the panel meter is not essential since the circuit also permits the use of a multi meter or other measurement device in which the case the second battery is then included in the meter although a number of variations of this circuit are possible to accommodate various read out devices and pressure transducer types.