My AC stopped working so I checked the compressor and it seemed to be working just fine. So I went and picked up some R134a with the gage on it thinking it must be time for a recharge. I plugged it in to the low pressure side, even made sure it was the low pressure side by tracing it out, and the gage read 130psi. If I am right that is 100 psi too high. Anybody heard of this and have an idea what might cause it?