This part is more of a temporary solution for myself and is meant more as an inspiration for an improved design.

Installation is as follows:

• install manometer with the fixed capillary tube inside the machine
• route the capillary tube to the top front between the case plates
• put the case with the slot over the tube
• add the printed clamping ring into the case
• slide the manometer in place in front
• with the bracket of the manometer tighten the printed clamping ring towards the back of the manometer to lock it in place (somewhat)
• fix the case to the machine by using some doublesided tape (as said, it's a temporary solution for me :) )

Manometer used: 1245001 for isomac machines.

Print the case oriented laying on the front surface. Use some manual support materials depending on the overhang capabilities of your filament / print settings.

Thoughts for improving the design:
keeping the slot helps with installing the case on top of an installed manometer. But it would be a better solution to implement a tightening solution which tightens the manometer inside by narrowing the slot with a screw-solution or similar.