Converted from a solid model of an Ashcroft gauge.
This was my test for 3d printing screw threads (1/8-NPT, 27-tpi) but I doubt they would print cleanly.
Also, although the part can withstand *some* pressure I obviously wouldn't suggest actually pressurizing it.
4.254 w x
4.254 d x
1.675 w x
1.675 d x