I designed and printed this pressure gauge pod for my son, not thinking to check on Thingiverse to see if anyone had already published one ! It's 2 pieces; the cylindrical part and a back cover that has a slot for cables. I did put a dab of hot glue on the back cover pins to make the fit tighter and am thinking of putting a miniature screw when comes time to close it permanently.
The OpenSCAD code is included in this publication but because this was a one shot design nothing is parameterized nor very elegant ... good luck tweaking the code if you choose to do so.
The gauge body is 52mm diameter and is held in place by the U bracket that pushes against a lip inside the cylindrical pod part. The gauge is inserted from the front and the bracket through the back.