Peter, when the rifle is next serviced and the reg removed, on reassembly get them to mount the air pressure gauge bracket "back-to-front". It doesn't change the position of the gauge but it puts the pivot hinge for the bubble on the right. The bubble now can be seen with the right eye but it folds into the park position the other way. There is however plenty of room for that to happen.
If you have the old type windicator you can do that too with the figure of 8 clamp and have the windicator on the right, but you have to push out the hinge pin and turn the arm over 180 degrees or it tries to park itself pointing forwards like a bayonet which is not a good plan.