I went to the dealer today. They took a look at the boost gauge and are going to replace it. It's on special order. The gauge is getting worse too. It makes a rattling noise as well as sitting at 12 in of vac with the engine off. I'm curious what it takes to get the gauge out and put another one in. Has anyone done this? Does it just push out of the housing? I hope they don't have to remove a bunch of crapola to get it out and put the new one in.
As for the A/C..I'm holding off on having the dealer mess with that. I'd like to see what happens after a little more use. I'm also trying an experiment. I've turned on the A/C to cycle it in the PM & AM and so far I've not heard that noise again. I shall see about that. Perhaps if I don't let the A/C sit for days without use it won't engage as hard.

 

Boost Gauge 101:
Take off the A-pillars
Undo the screws on the dash (two in the grating and one on each side)
Pry upwards gently but with light force
Unplug the gauge
Undo the two bolts holding it in
Swap and Reinstall

With the AC that might do the trick, because if the car isnt doing it, then the dealership will just "NPF" the problem (No problem found, unable to duplicate concern at this time). So it wouldnt be worth it anyways unless it were to be a constant thing.

 

Wow your gauge is acting exactly like mine, same symptoms.

 

I decided to swap the SRT boost gauge with one of my own. I broke both of the top A pillar clips in the process. Ordered some new ones from Dodge today, no biggie. The gauge I have in right now is an accurate gauge, however, it makes the same damn noise as the Auto Meter one. It's some weird rattling noise. What the heck? Do any of you have this boost gauge noise. Oh well...My new gauge is on order and for now I've got one that reads correctly.