Below zero is engine vacuum measured in inHg (inches of Mercury). Above 0 is positive pressure (boost). That's how my hungover *** exlpains it anyways.

 

My RA is stock with a Defi gauge, it tends to hold at 14-15 psi under hard acceleration.

 

My RA hit 18 psi tapering to 15 with the stock tune. I have tuned it with a boost pill to run 22-23 tapering to 18-19. It is possible to spike to 26 psi since I had mine reaching 25+ at one time, but it is blowing such hot air at that point that it was knocking causing the car to pull timing. I have more power at 22 psi. That's the small turbo for ya

 

my defi sensor broke, sensor was like 90 bucks, so i just got a prosport gauge. stock had boost spike to 20psi and holding 16 psi. ams flash, boost pill, intake now at spike 25 psi holds 20-23 psi.

 

I'm supposed to be getting 20-21PSI with my tune. Still need to install a gauge though.

 

how bright is you prosport? in the daytime??

 

http://images.google.com/imgres?imgu...a%3DN%26um%3D1 Not a mitsu, but that's about it. I had 4 Prosport gauges in my WRX and had no problem. The boost gauge I still have is easy to see as well. It's night that gets me. People have tinted them for this reason in the past.

 

DARN it... my gauge is like DIM as hell i cant even see it in the morning have tried everything rewire... direct 12v off the battery... everything its just suck to not see it in the morning man imma just pissed now

 

See look... fail...

 

Why not call or email them? They are local to me in Florida and warrantied my boost gauge sender quickly and gave me great after sale support.

 

Your gauge is deff not getting 12 volts. please double check the power wires.

 

i am getting 12v in fact im getting 12.31v on the red and white.... sigh... time to find something that works... that wont brake my bank... lol...

 

Hmmm.. J/C is it easy to see at night time ? or also dim?

We can take a look at it for you. can you call in for instant/easier troubleshooting/service ?

 

its bright at night hell dim in the morning im getting tried with fuzzing with this gauge now....

 

Thats strange, can you send it in for testing. We have no issues with lighting.
How long have you had the gauge.

Tell you what, give me a call tomorrow and ill help you over the phone.

727-572-9011

Ryan