Measure oil temperature using MFA

Hello!

I would like to install an oil temperature sensor in a friend's 1998 AFN Passat with air conditioning, at the oil filter flange housing there is a blind plug, where the sensor can fit. However, is it possible to display the oil temperature in the MFA (Multi-Function Display)? I was thinking of replacing the outside temperature display with the oil temperature, and since the air conditioning also displays the outside temperature anyway, it would be a good solution. Is there a possibility to reattach it?

... I think that if both donors have the same characteristics, i.e., the same resistance, it should work - however, it is questionable whether Temp > 50 is considered implausible and perhaps not displayed.

Due to the plateau function of the display, the result will hardly be usable...

Hi,

He wants the outside temperature display, not the water temperature. So, there isn't a plateau function... but I have my doubts about whether the outdoor temperature display will reach 130 degrees or so.

Best regards,

Jan

Okay, I missed it.
But also, keep in mind that the outdoor temperature won't rise as high.

Okay, I've tested it: I warmed up the outdoor temperature sensor with a hairdryer for 30 minutes, and the result is that the temperature only shows slightly more than 21°C. I suspected that there must be another sensor, so I removed the pollen filter, but there's no sensor there! Is there a wiring diagram showing how to add an oil temperature sensor retroactively? On some Passats, the oil temperature is displayed in the MFA. Can the MFA be unlocked? A schematic diagram would be very helpful!