dj_rock101

I installed the AEM boost gauge couple days ago and had a ques. about it. When I step on the gas it shows about 6-10 psi but as soon as i let go it'll show 24-26psi. Is this normal, because the gauge would show normal psi (24-26) when I'm steeping on the gas, not when i let go of it. Also, under hard driving the gauge will show 0 psi, but as soon as i let go of the throttle it shows 24psi again.
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Djstorm100

iTrader: (1)

wrong vacuum line

also know the difference when it is in KPA vs BOOST

chkmgnt59

iTrader: (3)

what he said, you tapped the wrong line.

dj_rock101

I checked like 3 times and I followed the diy instructions pretty well. Also, I think it would constantly show 0 if I did tap the wrong line. I think, there's a calibration problem which is well know issue with aem

Djstorm100

iTrader: (1)

It should show constant zeron regardless. it should show the vacuum, then go in to boost.

I havent heard or seen a calibration problem. I use their boost controller on my 9 second mustang and installed/tune on other case using aem stuff.. Good bang for the buck other than meth kits.

dek0026

Dumb question but do you realize there is vac and boost on a boost gauge? Not trying to insult you but I had to be asked.

I am starting to question the accuracy of this gauge as well but I will decide after i do a boost leak test.

chkmgnt59

iTrader: (3)

i have the gauge, and its perfectly accurate. Can you take a pic of where you tapped for it? also, where did you run the line into the car? through the wheel well or did you drill through the firewall?

KcEvil8

iTrader: (43)

the only negative thing about the gauge is it doesn't have a negative sign when it reading vacuum...that what 24-26 inches of vacuum you see when you let go of the throttle.

dj_rock101

thx for the input guys, I

dj_rock101

Thanks for the input guys, I had it run from the wheel well. I installed it again and the reading was off again. I found no sign of boost leak or pinching in the line. And, yes I know the difference between the boost vs vacuum reading. I bought it used from a friend and am planning to return it to him. I will either buy new aem or new defi soon!

MonacoGP

If the gauge doesn't read "0" with the ignition on but the car not running then you have either a bad gauge or sensor. Replace them both. Happened to me.