You can only set the regulator in two positions, 180 degrees apart, as the bolts are not in a square. So turning the regulator won't fix the issue completely.
On the other hand, you don't need to screw the cilinder fully to the end.
If you want to allign the gauge for cosmetic reason, just unscrew the cilinder a bit, it will hold it's pressure this way without a problem.
Looking at the picture you might turn the regulator 180 degrees, then you only need 1/4 turn back, otherwise you need 3/4 turn back in the current setup.
So, no big deal, but don't modify the cilinder in any way, 200 bar pressure of air can do a lot of damage to you AND other people. Keep it safe!