I got me a replacement pressure switch and installed it on my compressor. However it did not turn automatically as it should have. What could be the problem? I set the pressure around 90 to test it but never turned on when the pressure went to almost zero...what be wrong or what am I doing wrong?
There should be 4 screws on the pressure switch, 2 marked line for the power cord and 2 marked M for the motor. Is this how you installed it?
This link below has a video and instructions on how to install a pressure switch.