sylvester
Guest
I have a pressure gauge that when compared to my AI computer gauge it is off by 120 psi. I looked the back of the gauge has a rubber plug but I do not see a method of adjustment under the plug. Based on picking up cooled fresh filled tanks it appears my digital AI computers pressure is closer to accurate then the analog gauge on my fill checker. I can always subtract 120 psi however if there is a method to calabrate the 2, I would prefer that.