CharlieS
GOLD Star
You need proper gauges to do it "right". Odds are you'll be okay though. Untold millions of people have probably topped their systems off the same way you just did and I bet most of them are fine. If you are losing refrigerant, there is an underlying issue that shouldn't be there - these are closed systems. What you did may let you limp along with cool air until you can address the underlying issue (which will likely require a drain and refill, unless it is something as simple as a schraeder valve.