99 Dark Metallic Bronzemist SSEi, 187K, S3, P&P GenV, 3.4MPS, N*TB & LQ4, SLP Headers, Cat & EGR Delete, Hockey puck TA mount, Solid Trans/Motor mount, KYB fronts, MSD Wires&Coils, TRE-340, Thrasher CAI w/ 9" K&N, C-Ya Shift Kit, Hayden Trans cooler.
I think u have a similar problem to what I'm having because the most you should be seeing is 425 mv and instead of mine varying between 0 and 425 mine is varying between close to 25 and 525 to 550 don't exactly remeber
2005 Grand Prix Comp G, 180 tstat, KN intake, 3.6 pulley, pacesetter headers
Try replacing the 425 in with 685 that might get u close but it still won't be right on when I use 525 instead of 425 because that's what my mv output is maxing out at its pretty close to accurate but still not dead on
2005 Grand Prix Comp G, 180 tstat, KN intake, 3.6 pulley, pacesetter headers