Boost guage
 

Chaps pls excuse my lack of mechanical knowledge but is this how the boost guage is supposed to work?
When I turn the ignition on, it rests at zero

https://cimg6.ibsrv.net/gimg/www.sco...8d5a22a30a.jpg


however, on starting, it goes to about revving it or driving shows this.....

Is it supposed to drop back to 20 and rise to about 0 ?????
It is connected as below.....

https://cimg6.ibsrv.net/gimg/www.sco...e4a5a35c7c.jpg

https://cimg4.ibsrv.net/gimg/www.sco...f18ff68715.jpg

Any advice is appreciated

Yes it's normal, it'll be under vacuum at idle and -20 in/hg is normal also

When "off boost" you car is naturally aspirated so the inlet will be under vacuum conditions and the vacuum will rise /fall depending upon revs.
Only when the turbo comes on boost will it rise above 0.

Ahh ok - ty.
Even with hard acceleration, it doesn't rise much above 0 though.....

On tickover, it reads BELOW zero.
Only when driving hard will you see it moving.