I've had my stewart warner 40psi boost gauge for about 4-5 months now and everything has worked perfectly until just recently. When I shut off my car the gauge does not fall accurately to zero. Instead it sits at 1/2 a psi or 1 psi. I'm not entirely to sure if there is a way to fix it or adjust it.

 

did you order it through 42draftdesign.com? i would ask the retailer you bought it from and ask them. i have had my stewart warner gauge on for about a year and it sits at 0 when the car is turned off.

 

I actually went over to AMS since it is about 5 miles down the road from me and I bought it from the road. I actually thought about bringing it back to them since I have the original packaging. I doub they would take it back since it seems like a Stewart Warner problem.