Hacking your car’s multifunction display


[Steve] has an older third generation VW Golf, and as those who have owned one surely know, the beloved VR6 engine is wonderful but finicky. He says that the VR6 is particularly picky when it comes to oil temperature, so his daily routine involves hitting the MFA switch five times upon starting his car to bring up the oil temp in the display. This obviously gets old after awhile, so he rigged up a small circuit to do the switching for him.

He pulled the gauge cluster from the dash and then located the pins that correspond to the MFA display switch. Using an ATtiny12, he put together a small circuit that toggles the switch for him automatically each time he starts the car. Since his solution uses so few parts, he was easily able to tuck his creation behind the gauge cluster before reinstalling it.

Now each time he gets in his car, he is quickly greeted with the engine’s oil temp without having to fuss with his display.


  1. brad says:

    if you do this in the US, don’t let the DOT know you’ve modded your cluster. they don’t like that.

  2. andrew says:

    I don’t know anything about VR6s, but a more robust solution might be to install some kind of oil cooler.

  3. Steve says:

    Hello Andrew,
    this is my hack, and a oil cooler is already installed on a stock engine.

    the problem is that when the oil is cool (below 60°C) it builds to much pressure at high revs, so you drive it slow until 60°C are reached.


  4. harro says:

    Cool hack. I wish my Peugeot 106 would even have a revmeter.
    But I think your cruse control is even cooler.

  5. Charlie says:

    Guess the “German Engineering” wasn’t enough, eh? ;-)

  6. Taylor Alexander says:

    On the Saturn Sky Redline I used to have, the fog lights would only come on with the headlights if you hit the foglight button – but the button is electronic and resets every time you turn off the car. But the car looks better with the fog lights on, so I always wanted them to default to on. I wanted to do something a long these lines to toggle it at startup, but never got around to it. Neat hack though!

  7. Benjamin Sølberg says:

    This is a pure hack in every essens. I like !

  8. Tron9000 says:

    interestingly, with so few components, and such an easy fix……why haven’t VW done this?

    Then again if they did, th board would be a stupid price!

    “Zat vill be 3000euro bitte!”

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