i hooked it up thru the pressure tank and i have no problems what so ever. I figured since they were instructions from HKS, its probably the right way to hook it up. the only thing is when i have the boost controller off, i won't fit full boost till 4500-5000 rpms. When its on, it hits at 4000-4200...so i just leave it on
i hope this helps.
wez
wez