I'll start this out by saying that the other week I installed gauges (Boost and EGT). I was told that for my truck with whats done to it I should be able to make 35psi boost easy but the most I've seen is 28psi and that was accelerating up a hill giving it all its got in 4th gear. So I decided to check for boost leaks. Tonight I did a pressure check at 6psi and all the intercooler boots and everything seemed fine. Then I noticed the oil dipstick was hissing a little so I take it out and the air is somehow leaking in and coming out there. Would this happen because I did the pressure check wrong? Are you supposed to block off the one end of the intake when you check it? Is this happening simply because intake valves are open? Or could there be some other cause?I may sound a bit stupid... but hey, there's no stupid question right? A guys gotta learn sometime.All your advice will be much appreciated!Also one more thing if anyone knows. On the gauge there is an orange wire for the dimmer, but the instructions don't tell you what to hook it up to for it to work. So if anyone could tell me where to hook it up to that would be great.Kinda a long post but hopefully everything is clear for you guys, if not just ask what you want to know.

If you really, really want to block off the waste gate, unhook the line and plug it. The problem with that is IF you go over about 35 PSI you are overspeeding your turbo. At 35 PSI your turbo should be spinning as much as 150,000+ RPMs........ When they grenade......well, it ain't pretty and it gets expensive real quick too.

Here is an answer for your dimmer question, http://www.dieselmanor.com/diy/CMS-G2gauges/G2image17.htm tap into the light brown wire on the lamp connector. Note if you add the boost elbow with the set screw you will also need to add a turbo pressure fool chip other wise you will trip an over boost and see the "CHECK ENG" light.

Thanks for the link, helps me alot. As for the over boost triping the CEL I don't have to worry about it since I have a 12v.

The ECM does not look at how much boost is being made? I post one of those fittings on my truck and the SM at the dealership told me if I do it again the turbo will be on my dime!!! Had an over boost code so they ordered a new turbo complete with waste gate before they found the fitting. It cost me $75 for dinner for him and his wife.Don

The ECM does not look at how much boost is being made? I post one of those fittings on my truck and the SM at the dealership told me if I do it again the turbo will be on my dime!!! Had an over boost code so they ordered a new turbo complete with waste gate before they found the fitting. It cost me $75 for dinner for him and his wife. Don

12V's hardly monitor anything, technically they don't monitor anything at all. All there is sensorwise is oil pressure, water temp, intake temp, water in fuel, a/c high/low pressure sensors, battery temp sensor, hmm I think that's it. If any of those sensors are bad, it probably won't throw a code. I have disconnected just about all of them and never got a check engine light. Oil pressure disconnected shows no oil pressure and oil pressure light comes on. Water temp disconnected just shows really cold on the gauge. Battery temp disconnected changes nothing but supposedly it relates to charging voltage. Intake temp disconnected just makes the wait to start light blink constantly. Water in fuel disconnected does nothing. A/C sensors disconnected will do nothing, but a/c won't turn on. None of those throw a code.