I'm trying to find info on how to use the megasquirt as a piggyback ecu. I had someone tell me on here before it was possible, but i never can find info on how to use it as a piggyback. Maybe I don't quit understand because I'm just starting out learning about how ecu's work. I'm not sure what version to look at or what I need. I tried the search on here but there are way to many posts to go through them all. Is it possible to use it like this and if so where should I go to find the best info on the tried and true methods that work on our cars for this( oh yeah i have a 97 rs). I've downloaded all the megasquirt manual but not sure if I need all the options for what I'm trying to do. Any help would definately be appreciated.