There is a difference between positive and preload pressure. The MX Pro only has positive which needs anywhere between 30-65psi or lbs. It is easier to look at the bar scale which is betweeb 0-4,50. 1bar is close to 15psi that is what the manual says to put in the MX comp coil an the MX pro coil, nether have ETA and they have air on both legs. For positive it says to put 2,90-3,80 bar(42-52psi or lbs). This is for the MX comp air, MX comp with ETA, MX Pro air and the MX Pro with ETA. This is in both legs unless it is ETA.

I was wrong because the MX comp coil only has preload air and it only needs 0-15psi.