i installed my boost guage yesterday, it all works fine but when it is piped up my dump valve does not work does anyone have any ideas?

maybe i should pipe th guage to somewhere else but i do not know where else there is, i fitted a t peice from my dump valve for it as this is where i have always gone on turdo diesels before

 

You can plumb it straight into the inlet manifold. There is a small rubber blanking plug towards the left hand side of the inlet manifold.