I don't know what newton meters are, but the foot-poundage is, like, 1.
And yeah, criss-cross out from the centre when doing them up, maybe in a couple of stages. (Nip them up, then go back over them all, to final torque)
Old rubber will get hard and perish. New gaskets probably aren't expensive but gasket-goo or dressing will give a bit extra mileage.
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