On the 2005 base GT trim, that was part of something called the Interior Upgrade Package. It included MyColor, volt and oil pressure gauges, the trip computer, and aluminum finish on the dash, shifter, and steering wheel (as opposed to interior color plastic). I don't recall whether or not that was standard as part of the GT premium trim. It was not on the V6 premium trim.
Somewhere along the line between then and now, it became standard as part of the premium trims on both V6 and V8 models, and not available at all on the base trims. It was either with the 2010 facelift, or one of the later years of the 2005-2009 body style.