2 of these
http://www.rona.ca/en/industrial-pvc-pipe-plug-1-1-4-white-0068552
2 of these
https://www.rona.ca/en/flexible-pipe-cap
1 of these
https://www.rona.ca/en/pressure-gauge
drill holes in each pvc plug, seal the guage in one with jb weld, put a valve stem in the other.
Super cheap, less parts