Recommended household water pressure is between 60-70PSI. This video shows how to replace/add a new pressure regulator valve and also to replace/add a new quarter turn main shut off valve
I need to replace my regulator. My old one looks similar to what you've replaced. The inlet side has bigger diameter than the outlet side. The Watts product website is confusing. Can you please tell me the Watts complete part number which you installed? Thanks.