The R-package SimSpin measures the kinematics of a galaxy simulation as if it had been observed using an IFU. The functions included in the package can produce a kinematic data cube and measure the "observables" from this data cube, specifically the observable spin parameter λr. This package, once installed, is fully documented and tested.
https://ui.adsabs.harvard.edu/abs/2020PASA...37...16H and https://ui.adsabs.harvard.edu/abs/2019ascl.soft03006H