Over the weekend I replaced my AEM with the MTX-L. I replaced the AEM because the analog outuput was not reliable as mentioned above. It would shift from day to day and I would have to re-do the offset and/or slope but towards the end I noticed that the output was not even linear (sometimes). I got fed up with it and decided to try the MTX-L mainly because I wanted a gauge type WB to fill the hole im my pillar pod that the AEM left and also because of price point ($189 shipped from Amazon).
I installed it the same was the AEM was, with the power from the alternator via a relay and ground to body. I have one analog output going to my Aeroforce Interceptor and the other to the AC pressure for piping into HPT. I set up the transfer function in the Aeroforce exactly as it should be based on how I have the MTX configured and it matched up exactly with the display on the MTX across the AFR range from 9.9:1 to 22.4. I didn't have to mess with ground offset at all.
I have not hooked up HPT yet so I'll review on that later.
There are several features I like about the MTX:
I like that it will read all the way down into the 7's because my target WOT AFR is 11.5 and the AEM would only go down to 10. When I first started spraying meth I was likely richer than 10 in spots but I wouldn't have known it with the AEM since it would not go lower than 10.
Free air calibration. This was not an option with the AEM.
I like that the outputs are configurable. By default one reads from ~7.3 to ~22.3 and the other emulated nerst cell but I can configure them both however I like. I will likely set them both to read 8-18 across the 5V range to gain a little resolution. Also, if I wanted to verify that the Aeroforce and HPT are seeing what the MTX says its putting out I can set the outputs to flatline at a certain voltage and see if they match.
I like that stoich is configurable. Most wide bands are hard coded to show lambda as 14.7 but with the MTX I can set it, so I have set it at 14.2 to account for the ~10% ethanol blend in today's pumps. If I want to run E85 I could change the value again and still tune in terms of AFR instead of lambda.
The gauge's LEDs and LCD are configurable and independent of the analog outputs. The LEDs sweep from green to yellow to red. I can tell it I want green to represent 10-12 AFR, yellow 12-13 and red 13+.
I've always steered clear of the Innovate products because I judged they have a reputation for not being reliable but no one has really tried the MTX so I decided to giev it a shot. Only time will tell if it proves reliable.