Auto gage fuel pressure?

Does any one know how to adjust a fuel pressure gage. I`m reading 3 psi low. It all started after the first cold spell. The gage is located on my cowl panel.I`ve check the pressure of the pump with a known good gage. Any and all help will be great. Thanks

You could contact the manufacture I'm sure they would tell you, but if you know its 3 psi off just compinsate in your mind who will know as long as it runs right.

True! I just would like to know how too.. It`s just the way I am.Thanks