Now I am really confused. The GTechPro tach set-up looks really nice but it is expensive when you figure the cost of the gauge and the adder for the o2 sensor. Plus it don't have the ability to download info to a laptop.

I called Zeitronix and they were very nice but their unit doesn't store and offer the ability to download onto a laptop later either. Is this something I really need?

I called Innovate to ask about the XD-16 Kit and while they did answer my questions, they seemed to have a chip on their shoulder.