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Installation of the Innovate MTX-L wideband gauge kit is pretty straight forward. The MTX-L Installation manual covers most of the basics for a general install. We do, however, have a few specific suggestions below.
The following is provided for reference in the sections that follow. You can also get detailed pin out information, including ECU wire colors, off our ECU wiring page.
The red wire typically goes to a switched +12v source. The ECU pins listed above are good choices if you're wiring near the ECU. This wire would also typically be fused with at least a 3A fuse.
A good, solid high-current grounding point here. The ECU pins listed above are good choices or you can try a good, clean chassis ground point too.
The YELLOW wire is defined by default to have a mapping of 0V = 7.35 AFR (0.5 lambda) and 5V = 22.39 AFR (1.52 lambda). This will work nicely using ECMLink's LC-1 datalogging item. So run the YELLOW wire into your selected ECU input for logging and then configure ECMLink to use this input for the LC-1 log item (ECU Inputs tab) and, optionally, for the narrowband simulation function as well.
The BROWN wire from the MTX-L is defined by default as the "narrowband" simulation output. Because you're using ECMLink, you can leave this wire disconnected (but isolated from ground with some heatshrink or electrical tape) and simply use ECMLink's narrowband simulation function instead.
We generally recommend installing the MTX-L's wideband sensor in the front O2 location directly off the turbo. That is, of course, if you plan to run without a narrowband sensor installed in that location. We have been running our sensor in that location for years without issue. We do not believe there are any "heat" concerns what so ever.
When running an MTX-L wideband, you can simply enable narrowband simulation in ECMLink and use nothing but the MTX-L's analog output for both wideband data and narrowband closed-loop operation.
However, if you have the option of running both a wideband sensor and a narrowband sensor, considering doing so. This is probably more common on a 2G where you can run the narrowband sensor to the factory Front O2 pin while logging the wideband sensor on the factory Rear O2 pin, but there are enough inputs on a 1G to do the same thing.
The advantage to running a factory narrowband is that you get a good data point for checking up on the LC-1's calibration. The narrowband sensor is going to switch around stoichiometric. It's really good at that. So as long as you're running in closed loop operation using the factory narrowband sensor, you should see an MTX-L logged value of about stoich as well.
It's not a big deal either way, though. So don't go out of your way to make it happen. If it's convenient, great, give it a shot. If it's not, don't worry about it.