Boost guage question

[HIDY]

Hey i have a pro-comp silver lfg boost guage and the needle is sitting at 20 lbs of vacum not 0 is there any way to set it to 0

 

[Wheel House Motorsports]

yeah... if its a liquid filled gauge like the one I have there is a little screw in the side of the body, hold the gauge in your hand so the screw is at the highest point and loosen it up, then put it back in tight, this allows the pressure in the gauge to adjust.. it seems that its pretty far off.. its possible it could be broken, but mine changes a lot when I go from 3k up to 10k feet.. but not 20 mm of merc... maybe 5 or 10....