I believe I found it. My boost controller have a small hose connect to the back. What I did was I stick that hose into the bigger hose from the vaccum hose without using an adapter. My friend help me troubleshoot it. We hook a vaccum tool to it and found it was not holding pressure. So I put a hose adapter and did vaccum test now it's holding pressure. Then I shoot air into it and now the gauge reading boost.