The Megasquirt will work with most of the wideband controllers I've seen. It will accept both non-linear and linear 0-5 volt signals. Using the TechEdge 2A0 system for a quick example...



I tapped the WBlin pin, and hooked it directly to the oxygen sensor input for the MS. The only thing you need to do is tell the MS that it's looking at a linear signal, so it lines it up with this:



In theory, you could also tap pin 1, which has a non-linear response that looks like this:



I haven't tried the later yet.