Supercharger boost gauge

[vailTRD]

Which vacuum line are people using to tap in their boost gauges? I don’t think the results I’m getting are accurate. Here’s where I did mine

 

[vailTRD]

 

[LOLSNOW]

There's a hex plug where you can get a boost reference. You should get about 6-7 PSI at WOT.

 

[vailTRD]

There's a hex plug where you can get a boost reference. You should get about 6-7 PSI at WOT.

Ah. So replace that hex with a compression fitting? Looks like 1/4 npt?

 

[LOLSNOW]

Ah. So replace that hex with a compression fitting? Looks like 1/4 npt?

It's 1/8 NPT. Here's a link for one for reference

https://www.mcmaster.com/4406t16