Fitted a Denso Snorkel now I have a Boost Issue

[Krat]

Hi all.
Need some advice with this one. I have just fitted a new Denso Snorkel to my 07 D4D and when I started it up for the first time I copped an engine light and a boost level on the Scan Gauge of between 3 and 4 at idle.
Took it for a short drive and the engine light went off but the Boost remains at between 3 and 4 at idle. Infact, the boost level shows a decrease as I accelerate between gears. Haven't hit the open road yet to get it up to the 100 limit to see what happens.
I have cleaned the MAF, disconnected the battery for about an hour, then restarted. Same issue as before and no codes on the Gauge.
Any clues on what I have done wrong here. Snorkel fitted easily, wires reconnected and checked. A little puzzled at this stage.
Thanks for any forthcoming advice.

Kev.

[flip9]

Did you clean the MAP sensor filter as well? viewtopic.php?f=13&t=20711

[where'smycat]

Did you use a sensor safe sealant? Fumes might have affected the MAF sensor?

[mitch_893]

Did you remove the intercooler for any reason?

[rory18]

Are you reading boost via a scanner? If so just turn the key on and leave it for a few minutes and it should go back to zero

[Talktheroo]

Fitment of a snorkel should not affect the amount of air passing over the MAF sensor, Kev.
Go over the install or take it back from where you had it fitted. A lot to be said for the wrong sealants being used in this application, which was pointed out by Where's My Cat.
The Roo.

[Krat]

Thanks to flip9, where'smycat, mitch_893, rory18 ,and The Roo, for the quick replies.
I ended up rechecking the fitment and found no issues, no sealants used at all and intercooler was not touched so all good with these.
What I hadn't done was to recalibrate the Scangauge (Bugger - my bad), well done rory18. Engine light left no code on the gauge so couldn't check this any further but vehicle is running as usual.
Looks like an easy fix for a change .
Advice much appreciated.

Kev.