I decided to call a mechanic to fix my air conditioner. I only connected the sensors once. The connection seemed good and the gauges looked great. My upper side port started leaking when I removed the hose, I don't know if the gauge had anything to do with it, most likely because I cleaned the port with carb cleaner and messed up the rubber gasket. I would still recommend her. You have to use 134A adapters and as someone said you have to remove them if you want to screw the end of the hose to the spare fittings on the gauges.
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