I've got a 99 Miata. It has been a strong running but I decided to go MS to try and get some more umph out of it.
Installed the MSPNP this morning, that was easy enough, and the car fired up on the basemap. It bogs pretty heavy, even dies, when revving in the garage, but I am guessing that's a tuning issue.
Installed the Innovative MTX-L wideband afterwards. I removed the stock O2 sensor and used that bung for the install. I wired the yellow analog output to the stock O2 wiring. Calibrated the MTX-L. Then updated the project to a wideband O2, recalibrated AFR, and set EGO to single wideband per this page: MegaSquirtPNP by DIYAutoTune.com
The Innovative gauge seems to be working. I get a nice steady reading at idle of about 11.8 (no idea if that is right or wrong). The problem is that the MSPNP doesn't seem to be getting the proper signal; it's not steady, either, but completely erratic.
I have found a few other threads with similar issues but haven't found a solution. I'd love to get any thoughts. I'm attaching my msq and a datalog, though I'm not sure how useful that will be.