if your referring to what i think you might be you can get a 'no buzz' T piece that prevents it. think awesome might do them
 
Doesn't matter tbh replace it of the fpr i have found this one that would do the same job for cheaper, sorry.

I bought that excat one 2-3 weeks ago to cure mine rattling......works a treat and they come as a pack of 2, not that big tho I glued mine just to be on the safe side and have had no problems :)
 
get a no buzz t peice, it restricts the flow of air to the gauge so doesnt allow the same volume of air through causing the problem but allows the same pressure through. just replace it with the t piece you have used already.
 
Thats ok, I put them both in....one just in front of the T and the other just before it goes into the bulkhead, doesn't buzz at all now :)

Got a new guage on order to, hopefully be here monday :D