Hi
I have had this unit since August of 2016 and it has worked flawlessly. It connected to a MS3 and I have it split off to a Speedhut AFR gauge. I believe this started intermittently but I could be mistaken.
Both the gauge and Tunerstudio read properly during startup as well as passing the free air/butane test. The gauge never gets above 12 but the car drives normally and plug coloring is right where I would expect it.
I didn’t do a free air test without the gauge but I did shut the car off, disconnect the gauge signal wire and restart the car and tuner studio still read the same. no change.
Just reread this. I thought you said run the test with the gauge disconnected. I originally ran the tests with the gauge and MS3 connected Both MS3 and the gauge read as they should.
Here is a picture of a plug that I pulled after about an hours drive with the gauge between 10 and 11 AFR the whole time. It doesn’t look rich to me but I’m no tuner.