A/C Pro

If I use a universal gauge on a piercing valve can, can I remove the gauge before I’ve used the entire can without leaking the remaining refrigerant into the atmosphere?

No. Unfortunately while our new univeral gauges work with both types of valve systems, they do not make a piercing valve act like a self-sealing valve. If you are using a piercing can, you will want to keep your gauge attached to the can until it is depleted.