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PSI is (Pounds per Square Inch), not RPMs (Revolutions Per Minute), so how is this related to a tachometer which reads RPMs? Are you referring to the Superchargers Boost reading on the boost gage? If so, this sounds normal for a supercharger with the engine running.

PSI is (Pounds per Square Inch), not RPMs (Revolutions Per Minute), so how is this related to a tachometer which reads RPMs? Are you referring to the Superchargers Boost reading on the boost gage? If so, this sounds normal for a supercharger with the engine running.

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16y ago

PSI is (Pounds per Square Inch), not RPMs (Revolutions Per Minute), so how is this related to a tachometer which reads RPMs? Are you referring to the Superchargers Boost reading on the boost gage? If so, this sounds normal for a supercharger with the engine running.

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Q: Why is the supercharger's tachometer on my 2000 Bonneville ssei reading -10 psi instead of 0 psi when the car is on?
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