Right so I've fitted a t piece to the back of my hks ssq and attached a tube to the back of the gauge but when I switch on engine it reads negative and goes in to vacuum then goes up to about 5 psi when I rev it, need to get this done today! I've included a pic of the hoses an dv below, help!

 

When you say, "rev it", do you mean on the road? You won't get readings just sitting revving the engine, it must be under load. Mine is the same, no boost except under load.

 

Thanks u were right! Id had a couple of beers with my roast yesterday so I couldn't take it for a drive! Drove it today and hey presto!

 

LOL, it's always the little things that trip us up............