Just a quick video. I installed a used AEM wideband today. It's fully stand alone - not hooked to anything like DSMlink. I have no experience with this gauge. Does this look normal. Doesn't seem so to me. Any ideas? Thanks in advance!

Unplug the sensor and see if it still says the same thing. If it does then your issue is either a bad connection or a faulty gauge. Double check to make sure that there is not any water in the connector under the car. I have heard of that causing it to read 14.6 all the time.

When this happened to mine it ended up being a faulty gauge. Which would unfortunately mean that you bought a faulty gauge.

Bad sensor mine did the same got stuck and got an old sensor I had around and it worked again

FIXED!

I saw a video on Adam LZ's Youtube channel where he had the same problem with the AEM Wideband on Nicole's 240. His issue just turned out to be that it was unplugged. That got me thinking, so today I pulled all the plugs and checked for continuity. Everything checked out so I plugged it all back together and BAM!, it works! I think I just didn't push the plug at the controller in hard enough when I first installed it.