ok so my car was in the shop and while it was there i had the guy put in my boost guage for 2 reasons first i wasnt completely sure how to do it myself and 2 he wasnt charging for it ... slight problem... it reads no vacuum but where he installed the vacuum line idk how it could.. he ran it into the charge pipe i think its called it runs out of the top of the turbo to the top of the stock sidemount... basically im wondering if hooked in there can it read boost accurately or do i need it actually on a vac line to see the boost reading right ?