I bought a used gauge off of egay about 4 months ago and when I got it the needle sat at 0psi. During the 3 1/2 months of not being boosted the needle shifted to 1psi. NE way, every time I let off the throtle at full boost (4psi) the needle jumps to 5 then slowly drops. Does my gauge still work right? Am I really boosting 5 or 4? I figured it works during boost but off of it just sits a pound off? Ive heard of boost gauges tend to drift sometimes and its common. NE one have a prob like this?

 

My boost guage used to sit on zero now it sits on 1 so I think it's normal.