I just installed a new A/C system that uses O-Ring style fittings. How tight should the fittings be? I don't know of a specific torque spec to compare it to, of course you can't use a torque wrench but it would be nice to get an idea where to start. Would the spec be inch-pounds or in ft-pounds?

I used compressor oil to lube all fittings before assembly, at this point I just snugged all connections.