I have the Zeitronix Zt-2 as well with the optional boost sensor into my mani's. I use mine with a laptop only at the track. If your safely monitoring under WOT then you should be safe while normal daily driving. The program from Zeitronix is pretty simple and easy to use. There are too many points during your shifts to be able to monitor with just a gauge. Also this crucial data is what's needed if your going to modify your tune. Every 100 rpm to AFR and boost will show on your log.
Here's a sample datalog