Just a heads up on the cheap ($5-$6) pressure gauges. Not only they may not be accurate but also if you drop them or hit them a little hard with something they get damaged. Last time it happened to me I bought this TapRite one but time will tell how much better it is. With all things made in China now it is very difficult to gauge quality just by price when a 66% increase is still $10 :-\
https://www.homebrewing.org/Taprite-0-30-PSI-Gauge-RHT_p_5381.html
https://www.homebrewing.org/Taprite-0-30-PSI-Gauge-RHT_p_5381.html