Guage sits about that much below zero when the car's off, and when I hit full boost it reads ~8psi... but my stock guage says I'm boosting a correct ~9.5psi. So I'm assuming it just reads ~ 1.5psi below what it actually is. Plus I'm just sick of the Autometers, I don't like the orange needle, and they're a little too... generic for my taste.