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However, a buyer noticed that the tachometers in the trucks indicated the redline at 6,500 rpm. Turns out the tachs are incorrect, and GM is going to fix the graphic in future trucks. After James ...

Read more: Every Ford EcoBoost Engine Ranked Worst To Best All vehicle tachometers will have a redline that typically begins at the 6,000 to 7,000 mark. The redline is the maximum RPM rate the ...