There are two ways to do this: 1) Change the solver units from their default of SI units to English inconsistent units of lbm, psi, lbf, etc. The problem with this approach is that it can cause issues later in post-processing as the units in the res file will be in English units and care must be taken in to take into account a gc conversion factor in certain calculations. Would Recommend to keep the solver in its in SI to avoid these issues. 2) In the monitor expression, simply divide the expression by “1 [psi]”. This will force the numerator to be converted to units of psi, then be divided by 1[psi]. This is the recommended approach. For pressure monitor points, recommend creating an additional variable, where the additional variable is based on the expression Pnew=Pressure/1[psi]. Then, for the monitor point, refer to the additional variable instead of Pressure.