I bought this unit primarily for use with my existing vacuum chamber. First, oil flows out of the vacuum pump. Vacuum, but oil runs out when stationary. I just used the gauges last night to install an AC mini split I had and when I checked the system for leaks the gauges worked fine. I then evacuated the system for 1 hour and checked for vacuum leaks. It worked well. Then I opened the system and put it into operation. At this point, the pressure gauge on the low-pressure side read no more than 0. The pressure gauge is dead and useless. Unfortunately, the return time has expired, so I'm stuck with replacing the sensors from the bag. On the plus side, the sniffer worked well and found leaks in both the new and previous installs. (Update) This supplier has made every effort to fix this. I haven't had a chance to use a replacement but they replaced the entire purchase.
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