You can get a boost tap from aliexpress for quite cheap. It's metal and it locks in place so you've got nothing to worry about. The tap fits between the intake and the pcv. For a boost gauge, dont cheap out and get one from a reliable source. Otherwise your measurements will never be on spot.
One thing to note, tapping the pcv/intake connection pumps a sh*t ton of oil into the boost gauge.... A better option is to tap the area near the charge pipe right before the throttle body but it requires some custom diy.