So my car 94 gsx 6/4 combo was boosting 14 psi when I got it, no mbc or anything. When I rebuilt the motor and slapped it back in and it only does 9-10 psi idk why do I got an mbc now the stock gauge reads 13-14 psi but my auto meter gauge reads like 20. But only feels like 13-14 pounds. Does it seem like the gauge is bad or does it the gauge need to be re routed. As I recall it read fine before the rebuild but that was so long ago. So any thoughts

Have you done a boost leak test yet?

Yea, no leaks

How do you have the wastgate hooked up? Using the stock bcs? What type of bov? Also how do you have that boost gauge routed?

What stock gauge are you going by? I hope you know the "boost" gauge on the cluster is useless and you shouldn't base off what that's reading. Second is the autometer gauge needle at zero when the cars off?

Yes the needle is at 0 when it's off and around -15--20 when idle. And the boost controller is teed in between the wastgate line