For all sensors there is a question about "Machine max". This setting only affects the graphical scale of the Drillsymbol. It should be set to the expected maximum value during normal operation.
Enter Setup menu and choose Sensor setup
Change the Depth setup. Select foot/minute for US units, meter/minute for metric
For "Force", select "ton (short) to get US units, or any of the other for metric units
Torque - Select psi for US units, any of the other for metric. If you have sensors for different gears, answer "YES" on the question.
Flush pressure - Select psi for US units, any of the other for metric
Flow rate - select gallon/minute for US units, liter/minute for metric
After setting the Sensor "units" the vaules displayed on the D-Mon screen will be presented in the selected units.
The settings also affects what parameter codes will be used in the STD file (D, or DU for depth etc). The setting for each sensor is individual, so the best thing is to set all of them to US or Metric units in order to avoid getting a mix of US and metric units in the datafile.