should it e a zero when off? does that mean its 10 psi off or is there no telling?
It should be reading atmospheric pressure when the car is off (0). As for the degree it's off.....who knows. You shouldn't justify using a broken component for critical information.
03 SRT-4 39,000 miles and boost gauge is sitting at about 1-2 psi when off. Used to sit right at the end of the gray area but never right on zero. Will buy SW gauge soon .
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