One of my Livorsi water pressure gauges is zeroed out a 10lbs. Is there a way I can just rezero it my self? They are a few years old but I just used installed it and after 1 day of use it did this. Maybe I should have just kept my cheap gauges in.

I would ship it back to Livorsi, they likely won't charge you to repair it.

Did U Blow Air Into It

Did you remove the hose from the back of the guage?
If might have some dirt in the hose going to the guage holding the pressure at 10 PSI

Disconnect the pressure hose and see if it goes back to zero.

Might have frozen during winter. Mine did this. Now I blow water out of the lines during winterization.

Thanks guys, it's still accurate just 10lbs is the new 0lbs. I disconnected it and did not change. I put 10lbs to it and and it read 20lbs pressure drops off fast when pressure is released. I guess this winter I will send it back and see what they say.