Following the release of its updated turn-by-turn navigation app that added support for the original iPhone and iPod touch, TomTom has revealed that first-, second-, and third-generation iPod touch users wanting to purchase a TomTom-branded GPS solution will need to buy a separate car kit than the one offered to iPhone users. In a Twitter update, TomTom representatives wrote, “The existing TomTom car kit is designed for the iPhone. A new car…