rattling boost valve
 

Hi,
I have an auto gauge boost gauge and it makes "rattling" noises when i come off the gas and the needle attempts to move down the gauge, but gets stuck whilst doing so whilst it makes this rattling noise. I was wondering if this is due to - and i'm not technically minded - the pressure inside the gauge that has moved the needle not being able to quickly find a way back out the gauge or is my gauge cattle trucked.

Cheers for any advice
Rick