I installed my guage and when I start the car it stays @ 0. Its goes to 6 or 7 psi @ best when I stomp on it. I have a Neuspeed chip new plugs,fuel filter,k&n air filter,Mass air flow sensor. Any ideas what it could be? Besides everything lol? How hard is it to install the DV and where is it located on a 2000 Passat 1.8T? Thx guys.