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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
It's on the oil filler tube, which is usually on the driver's side of the engine, near the brake booster. Twist to unlock, plug the new one in an re-install. Cheap an' easy.