  We present kinematic observations of H$\alpha$ emission for two early-type
galaxies and one disk system, members of the Hickson compact group 90 (HCG 90)
obtained with a scanning Fabry-Perot interferometer and samplings of 16 $km$
$s^{-1}$ and 1$\arcsec$. Mapping of the gas kinematics was possible to $\sim$ 2
r$_{eff}$ for the disk galaxy N7174 and to $\sim$ 1.3 r$_{eff}$ and $\sim$ 1.7
r$_{eff}$ for the early-type galaxies N7176 and N7173 respectively. Evidence
for ongoing interaction was found in the properties of the warm gas of the
three galaxies, some of which do not have stellar counterparts.
  We suggest the following evolutionary scenario for the system. H90d is the
warm gas reservoir of the group in process of fueling H90b with gas. H90c and d
have experienced past interaction with gas exchange. The gas acquired by H90c
has already settled and relaxed but the effects of the interaction can still be
visible in the morphology of the two galaxies and their stellar kinematics.
This process will possibly result in a major merger.
