  In this work we study the tau-function $Z^{1D}$ of the KP hierarchy specified
by the topological 1D gravity. As an application, we present two types of
algorithms to compute the orbifold Euler characteristics of $\overline{\mathcal
M}_{g,n}$. The first is to use (fat or thin) topological recursion formulas
emerging from the Virasoro constraints for $Z^{1D}$; and the second is to use a
formula for the connected $n$-point functions of a KP tau-function in terms of
its affine coordinates on the Sato Grassmannian. This is a sequel to an earlier
work.
