For those with Air Compressors in the garage...

You want anywhere from 120-150. So you're doing it right for air tools. The 90 psi is a minimum for the air tool to work in it's specified torque range.

The regulator and tank pressure are independent. The pressure switch on your tank is set to 120/150 on/off. The regulator can be set to any pressure you need without effecting tank pressure. I also keep mine around 90 psi.

Is your compressor on wheels or stationary? If it's stationary, I suggest a wall mount filter/regulator combo to keep the amount of water in your lines down. Plumb it over to the wall using black pipe. Those cheap "leader hoses"really cut down on your airflow. Just my two cents. Here's what I have...

Ah the cleanliness make me so happy to see!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!