https://www.jaycoowners.com/forums/gr...essure%3F.html
Hi Mark. May I suggest you read all the posts on the Jayco Precept Owners forums. You will be amazed at how many questions will be answered for you.
The above link addresses psi.
There might be a sticker with info on the left lower wall (by your house power switch) or near the floor under the driver's window.
Happy reading,
Darrell