WOODY

so with the airdog 165 you have to drill a quarter inch hole in it for the return line being used in the old supply line? im having some issues with mine at the moment. and i installed a sump kit on it. if i get down on it hard it will jump in psi pressure.and not by alittle bit about 7 psi. also it seems like mine drops pressure alot too.i dont have alot done to my truck mainly just a quad and on stage three out of ten i suck down pressure to about 14. and then it will shoot up too about 26-27psi and im just wondering why it would be doing this.