Umarex Bottle upgrade alignment?

Upgraded the standard air tank with a bottle and adapter. Hand tightening the bottle onto the Zelos. Wish it will turn another quarter turn so that the pressure gauge dial can be in the correct orientation. Anybody have any suggestions on how to do this without having to sand down metal. ?

IMG_2810.jpeg
 
is that a burst disc on the side 5000 psi?
is that front lens resting on the rail? looks close from that angle
not sure if the same shims will work like they do for the notos
but they make different sizes in .1mm increments i shimmed my plenum extension with them worked mint
maybe you could do the same?
Yes 5000 psi burst disc, no the scope does no contact the rail