I have had bad luck with Autometer Boost gauges myself. The one I have now after 4 replacements still reads 2 psi off. When it shows 6 psi I am at 8 psi. When I am at 10 psi it shows backwards it shows 8 psi. I give up with the silly thing. I keep it to show the vacuum because it seems to be always correct. I run a PMS unit and I have a remote mechanics 5" pressure gauge and they show the same psi but the Autometer is always off.
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