I run a fairly simple Holley EFI setup on a V8, so its more of an engine management tool than an all-inclusive motorsports solution. It's more useful for engine tuning/troubleshooting than for lap feedback since I can't overlay it with GPS and its not integrating with any OEM CAN data.

 

If yall haven't taken a look at this guys stuff you might find it interesting. I personally like the old analog style, and am doing what he's come up with in the last video he produced. Not expensive - I think I'm all in at about $250.