They're all pretty much the same. I would recommend a dual turbo timer, because it has a built in tach. I have the greddy single turbo timer, which I like alot. It plays music, and lights up..You can program the song that it plays when you start the car, and when you turn it off. I have some japanese song when it starts off, don't know the name. And "Another one bites the dust" when I turn it off...
