Upgrade your Peterbilt 388 with a variety of custom dash knobs for easy adjustments and a smoother drive. From chrome air brake knobs and AC control knobs to trailer knobs and computer control dash knobs, we've got you covered. Swap in these aftermarket, oval, and replacement dash knobs for a personalized touch. Ready to upgrade? Buy dash knobs online today at 4 State Trucks and snag the best deals today!