Resetting Turbo Boost Dial

[Noblebenn]

Hi.

When the engine is off the turbo boost dial reads just under 0 but when started and on tick over reads about -0.7.

Is this correct of should it read 0 on tick over? If so how do you settle dial?

Thanks

[weeboot]

At idle it's reading vacuum, so it's perfectly reasonable to expect the 0.7 reading

[JW027]

Mine does that too. I spoke to JS about it and they tell me it's right.

[andygtt]

all engines run vacuum when the throttle is shut... and its this vacuum (in a car running a plenum like ours) that powers your brake servo