I've stumbled upon my MTX Innovate gauge acting very funny and i can't figure it out. I've never had any problems with it untill now. I drove to work and the gauge was fine and status's were normal. I get off work and notice that my gauge is stuck on 22 which is the leanest the gauge can read. When i give it gas it drops all the way to 7 which is the richest it reads. It now flickers back an forth between 22 & 7 on its own.

I got home and decided i'd try to Calibrate it.. i disconnected o2 and did a free air calibrate and put o2 back in. Nothing changed. I've head maybe i should disonnect o2?

Here is a video of what its doing

 

Do a full calibration first (like initial install), and verify you have a solid isolated ground. If those check out, it's most likely a bad o2; heater circuit burned out. I see it all the time. Get a new sensor (typically available at local parts stores), make sure it's not too close to your turbo (if equipped) and use a heatsink or relocate it if that's the case.
Otherwise try not to keep your key on without the engine running for long periods of time, that will also burn out the sensor.

 

Problem solved, did a full CAL. Thanks for input!