no matter what i do i only see 10in/hg vac and boost is off by about 2lbs compared to the stock gauge. i used the blue wire with white stripe off of the fuse pannel for power which maintains power while cranking. for my vac source i just used the stock location, then switched it over to the manifold source from the throttle body and i still get the same readings. with the car as it is when i switch the line over to the stocker it reads just as it should, 19 vac and boosts normal. maybe the map sensor the gauge comes with is bad? anyone who has this gauge please help.