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PLXint / PLX Interface Board with ECU Cable

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There are 3 Ways to use the PLX gauge interface:

    • As a display only (no wideband O2 input, or O2 input via analogue input).
    • With a PLX wideband O2 sensor
    • With an Innovate wideband O2 sensor, TC4 4xEGT probe input, or both



In each of these cases, you will need the PLX interface board:

    • The PLX interface board needs +12V and GND on the connector on the left. You should connect this to the ECU +12V and power ground.


    • The interface board has a 4-pin square molex connector (bottom right in this picture) which will provide power for a gauge. If you want to run multiple gauges, you can connect them in parallel to this connector. This connector provides +3.3V and +8V for the gauge. The gauge might come with a separate voltage regulator with a 12V input, 8V output and ground, and it will say in the documentation that you need to cut a wire and connect this regulator in instead. Don’t do this, just plug it into our board. I did it this way to make it easy for people.


    • The interface board also has a 3.5mm headphone socket, marked “PLX output” in this picture. The gauge needs to plug into here. If required you can use multiple gauges using the double adaptors that PLX provide with the gauge.


    • The interface board has a 2.5mm headphone socket on the bottom left in this picture. It has to connect to the “serial in” port on the Select ECU using a straight-through 2.5mm cable. You can buy them through a dealer for Innovate motorports; they have a very short (6″) cable (part number 3789) as well as one that’s about 3 ft long (part number 3760).


    • This is where it varies depending on your wideband connection:
      a) If you’re using a PLX wideband sensor, connect the output of the “sensor module” (the one marked “TX”) into the 3.5mm port marked “PLX input” on the board.