air pressure gauge for supercharger

Asked by Feb 16, 2015 at 11:45 AM about the 1999 Ford F-150 SVT Lightning 2 Dr Supercharged Standard Cab Stepside SB

Question type: Maintenance & Repair

when engine starts,gauge jumps down to negative instead  of showing air pressure engine
runs perfect.

1 Answer

7,995

is there a backward electrical current to it

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