I have noticed that my hijacked boost gauge will read between 14.5ish to 12 and waver between them in a pull. This could be a few things and it may not actually be varying that much. It could easily be gauge inaccuracy. My IAT hijacked gauge will bounce between a few readings just cruising at 75 on a cool day. I'm talking 10+ degree jumps and I can't imagine it's actually increasing and decreasing that quickly. Until I pull some logs showing boost pressure is varying, I'll chalk it up to gauge variability.
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