Per GM Spec with oil temp at 176 - 212 F, idle oil pressure should be 22psi. At 3000-3500 rpm, 55-94 psi. That's on a 1.4.
On a 1.8 the idle pressure should be at 18.85 (that's what it says) at 170* or higher. There's nothing saying about at higher RPM on the 1.8.