A boost gauge is a gauge that indicates the amount of boost pressure present in the intake manifold. Many also measure the vacuum level in the intake manifold.

On Z32s

The stock gauge cluster, with the boost gauge under the speedometer, looking mad as hell.

Factory Twin Turbo models had a boost gauge integrated into the speedometer, mirroring the oil pressure gauge under the tachometer. While helpful, the stock boost gauge is considered fairly inaccurate, and those raising the boost pressure on their Zs are highly encouraged to buy a high-quality aftermarket boost gauge to prevent setting the boost level too high.

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