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Aftermarket Boost Gauge - correct readings?????

I have an aftermarket Autometer Pro-Comp Ultra-lite Boost Gauge (model 004477) that was fitted to the car when I bought it. Are these readings normal?

 

Engine Off needle sits at 0.

 

Engine on (Auto in drive) needle sits at 16-17 Hg (VAC side of gauge)

 

Blasting on full throttle needle sits at 9 Psi (BOOST side of gauge)

 

Foot off the gas needle sits at 20 Hg (VAC side of gauge)

 

boost_gauge.jpg

 

Any help appreciated.....

 

Thanks

 

Martin

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    sounds right, stock boot is 9psi, safety is 7psi, so that's always a good thing. but why 2 pictures?

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