I have a defi-D gauge that I bought new a month or so ago. When I first bought it the needles was right on the 0 when the car was off. But recently that has changed and it now is about 1slash vacuum. My question is since it is a mechanical gauge when it displays 20psi am I really boosting 21?

 

defi is pretty accurate, so don't know what to tell ya

 

Maybe the hoses arent tight enough and its leaking air a little bit?

Have u checked to make sure there all tight?

 

I'm 99% sure they are spot on, they are zip tied and all. The thing is that it should be on zero when the car is off and it's about 1vacuum. When I first bought it it was spot on but it seems that over time it slowly kept getting closer to vacuum. Should I try contacting defi? The gauge is only 4 months old at the most

 

The D-gauges are known for reading a bit high, if I recall correctly.

Not zeroing out is a problem, though. I'd contact Defi, those these gauges have been out of production for at least 8 months.

 

Here are some pics, it seems to progressively get worst and worst every few weeks. The instruction manual says it has a 1 year warranty but unfortunately they dont offer this model anymore.

 

Yeah, doesn't matter if the "hoses are all tight" when the car is off. That seems to be more of a calibration issue with the gauge itself. Have you tried replacing it with a known working gauge?

 

Well before this gauge I had prosport gauges even those cheap prosports were right on the dash. I hope the extra $ i pay for defi pays off with their customer service.

 

I hope it works out too. Good luck!

 

I have the same issue although mine sits at about 1 PSI of boost instead of zero. This is pretty common on these gauges from what I have seen.

 

hmm when i had mine it never did that