Once you solve the model, you just use the rsys,solu command so that when you plot or list stresses such as using plnsol or prnsol, they are reported in the element coordinate system. You end up with a local CS for each element,which is fine.
You can loop over your elements in a *do loop to do this in an automated fashion too. You can create a local coordinate system using one of the several commands such as cs, then use the emodif command to modif the element to use that local coordinate system (change the esys of element).