My boost gauge is steady up to 10 lb than bounces around 10-15 lb then is steady till 20 and bounces a lot up to 25. Is this normal? turbo issue? or just plumbing?(i have t in map line)

 

Boost gauge bouncing is fairly common because you tapped into the map sensor line. The map sensor releases a little bit of air, hence the bouncing. Try to move your boost gauge closer the the intake on the map line. That may help.

 

Also check to be sure there are no kinks in the line.