I tried searching, i knew i found some info last winter on how to rig up a few cheapy bike computers with some software some dude made and project onto a wall or something...

Search for "IRO sprints."

thanks yosh,
i keep trying and either i suck at the bikeforums search or it sucks, i tried google too... i must really suck.

Okay I just tried searching for IRO sprints and the only thing that showed up was this thread. Hopefully at some point the search function will be fixed. But yeah, the software that was available was made for the IRO sprints competition in Chicago.

there's a bunch of discussion about it on www.chifg.com. dunno if any of it is instructions per se, but you'll at least find the right people to ask.

opensprints.org will get you started

Navid in Toronto made that system with a friend.

He is here:
https://www.r-evolution.cc/site/index.php
He posted the item on global guts, click his name and you have his email..