[Blue Bomber Man]

If you are going to be using the scangauge in other peoples cars, you might want to rig up some portable power source for it... It would take too much time to install it over and over again.

It's funny, I was thinking that down the road I would start some sort of mod shop for aerodynamics in a year or two.. but your idea is great and has very little risk involved.

If I decide to try it I will let you know and maybe we can share ideas with each other to be more successful.