A/C Questions

i checked the a/c pressure using a manifold gauge and my low side is reading somewhere around 27 psi, while my high side is about 200 psi... is this enough pressure or should I add more refrigerant and check to see if this will enable the compressor to cycle as it should??? on the BGB that st165 shared with me, it says there the pressure should be 30 psi lo and 350 psi hi for the compressor to engage...

FWIW, I already used almost three 12oz. cans of r134 gas...