Boost gauge reading low on the 1994 K3500 6.5 TD Have home made turbo master.

[jrsavoie]

Hope I posted this in the correct place. My first instinct was to post in the 6.5 section. Please move this thread If I did not get it in the right section.

The Boost gauge on the 1994 K3500 6.5 TD is reading low - about 4 or 5. The truck Has home made turbo master. How do I tell if it's gauge issue or if the wingnut on the turbomaster loosened up?

I tightened the wingnut a little and the boost came up some.

But now not knowing for sure if the gauge is reading correctly, I am scared to crank it back up to 8 lbs. Is that a good setting?

I can't figure out how to make sure that 8 lbs on the gauge isn't really 15 lbs. I do not have a spare guage to try.

Any ideas and recommendations would be appreciated

 

[ak diesel driver]

exhaust leak??

 

[jrsavoie]

I don't hear an exhaust leak. But then again, I don't hear much. LOL

 

[Will L.]

A lot of parts places have a deal of "loaning" tools where you pay for it, then return it when finished for a refund. Try to find one of them and get a fuel pressure gauge for carburetors for to compare your gauge to.
Napa is 1 of the stores here that does it...http://www.napaonline.com/Catalog/C...acuum-Pressure-Testers/_/R-SER2521_0293962589