  A generally anisotropic equation of state originally derived in the context
of Newman-Janis rotating systems allows for vacuum energy at a specific
density. In this paper we examine the possibility of using that equation of
state for cosmological dark energy. We treat the case of large scale ordering
of the directions of the energy-momentum tensor eigenvectors with a Bianchi
cosmological model, and treat the case where the ordering is random on small
scales with an effectively isotropic FLRW system. We find particular spacetimes
which evolve towards a vacuum energy/ de Sitter like configuration in either
case. In the anisotropic Bianchi case, the system can have behavior reminiscent
of big bounce cosmologies, in which the matter content approaches vacuum energy
at large scale factor and can behave in a variety of ways at small scale
factor. For particular conditions in the effectively isotropic case, we can
evolve between true and false vacuum configurations, or between radiation like
and vacuum energy configurations. We also show how some simpler equations of
state behave under the same assumptions to elucidate the methods for analysis.
