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When a tech2 is hooked up to the truck and your looking at the boost pressure sensor reading should it be reading 0 or 14.7 psi at idle ??

Any one know ?

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I have a 03 C4500 and live at 5,000' ALT. On my snap-on scanner today at idle my boost reads 24.8 hg and baro reads 25.2 hg. so if you live at sea level and the tech2 reads in psi 14.7 would be right. Standard sea level baro is 29.92 hg = 14.7 psi
 
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