Maybe paranoia but out in the car tonite windows up radio off. Boost gauge is on the A pillaer and when it starts to boost it makes a blowing noise. Surely. It shouldn't make a noise as its. Sealed for a constant reading??

 

Is the gauge reading correct?

 

what car? petrol or diesel?

diesels sound like you have a wasp inside the gauge when the boost comes up
petrol might need a one way valve as some i've had have needed.

out of interest what brand of gauge, some of the cheaper one's do this.

 

No it shouldn't. Sounds like it's leaking mate

 

Its on a S2 RST, so petrol, and its a Nomad gauge.

So any noise eminating from it is a bad thing then, yes?

 

sounds like the small air pipe to the gauge is leaking out air. Check it's I'm properly.