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I used the diagnostic mode to see my rpms digitally and I noticed that my tach is off somewhere between 200-300 RPMs. Anyone else have this problem? It'll say i'm idling at 7xx and my tach will read a hair under 1000. 850 and the tach says 1100
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'02 GT vert - white/tan - Supercharged.
Up Coming Mustang Parts: extra idler pulley around SC, front heat exchanger
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