Just installed a new digital boost gauge and the boost seems alright. At WOT it sticks right at 18-19. When I idle or let off the gas however I go to -11 - 12ish. Every gauge ive seen in a mazdaspeed 3 or 6 vacuum's at around -18 to -20.
Seems like its measuring vacuum the same as the boost. Which will show around 11,12. Most guages measure the vacuum at (in Hg) which mine shows around 26 at idle.
