[Derek Bessette]

I would try disconnecting the entire circuit after your pressure gage and pressure switch. Once you have done this plug the open end. If you are using tubing, a t-fitting with two ends connected with a single loop of tube works well as a plug.

Try your compressor using this setup. This will help determine whether your problem is a leak or actually with the compressor.

For instance, if the pressure goes up to 120 in this situation, you would know that you had a leak somewhere. If the pressure still stops at 75 psi then you need to start looking at your compressor.

Hope this helps.