How accurate are boost gauges?

[Blown46]

I run the Autometer Phantom boost gauge (mechanical) and wondering just how accurate they are?

Anyone have any insight?

Thanks.

[Redsnk95]

A mechanical boost gauge is usually right on, not much for it be off on.

Troy

[VibrantRed94GT]

well does where its mounted have anything to do with how accurate it reads? mine just threads right into the back of the intake (edelbrock rpm) Where as before i just t'ed off one of the vacuum lines on the fuel pres regulator.

[Blown46]

Just to clarify why I was asking how *accurate* boost gauges are/were. The reason is when I was on the dyno (around 3/4 weeks ago), I was only seeing 7psi of boost when I know that I should be more around the 9-10 psi range.

I realize that a mechanical gauge either works or doesn't work and I've had pretty good luck with all of my Autometer gauges thus far.

Anyway getting to the point, I never really thought about it too much but when I did dyno the humidity was like 98.9% and it was raining that day. I didn't give that much thought but I think that was one of the main reasons that my boost was so low.

This past Friday I took the car out and was seeing a solid 10psi.

Sorry for the confusion.