help needed turbo guage

[5seaterT5x2]

just in the process of putting glt back on road bin standing bout 11 months started no problem but as in the title the boost guage is showing nothing no movement at all but car seems to go pretty good. no idiot lights on and such any ideas be much appreciated goin mot later today. as i say bin standin bout 11 months but has been fired up a few times in that period just to keep the oil up etc

[AlanG]

It is a simple vacuum guage,my friend. Check the pipe for fractures.

[t5 pete]

see if the vacume pipe on the manifold tree is still connected its a yellowie white colour and only very thin about 3-4mm external diamater