As per the workshop manual (1985 onwards)
Normal on + off road use. All speeds and loads
Front 28 PSI / 1.9 Bar
Rear 35 PSI / 2.4 Bar
or when lightly loaded (rear axle weigth below 1250 kg)
Rear 31 PSI / 2.1 Bar
Off road emegancy up to 25 mph
Front 16 PSI / 1.1 Bar
Rear 23 PSI / 1.6 Bar