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Instructions should have come with it. If not, try and get it from where you got the gauge. In a nutshell, after you assemble the gauge, you need to get power to the gauge tapping into an electric source and a ground. There is also an air tube that goes through the grommet under the steering column, around counterclockwise to the front passenger corner of the engine coompartment, tucked under just behind the intake there is a little valve outlet. You need a t-connector to pull of the tube thats there, put on the T and then hook up the tubing from the boost. If you really have trouble I can send you a copy with pictures, but I dont have it electronically to email. Its really not too hard if you are patient and somewhat handy.
I have the auto meter gauge. I long curved needle nose to yank it off, and then the same to push the other tubes back on. Its a pain so just be patient , and use a work light so you can see under the manifold.