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Using cluster temperature display to show EGT? - Printable Version

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Using cluster temperature display to show EGT? - Matej - 06-22-2015

This is probably a silly idea, but has anyone attempted to convert the W201/W124 external temperature display in the cluster to show EGT's instead?
I am not sure if it could be as simple as relocating the external sensor to the manifold/downpipe (stripped of any non-metal parts, and with proper shielding) or if the sensor would get fried immediately, or if the LCD can even display numbers that high (at least 999 would be nice, even better if the Celsius display is used).
Another option could be to wire a proper EGT sensor into the outside temperature sensor harness, though I am not sure how one would make the circuit board display the sensor readouts correctly.
Finally, I suppose it could also be an option to just get a digital EGT gauge and retrofit it behind the temperature display, but I thought it would be nice to use the factory unit for a stock look.
Thanks for any input or ideas.


[Image: 434306d1332710636-outside-temp-gauge-com...-gauge.jpg]
[Image: VDO_4562.jpg]
[Image: europlate-3.jpg]

RE: Using cluster temperature display to show EGT? - Simpler=Better - 06-23-2015

Figure out what type of thermocouple the stock setup uses (Probably a K type?) and get one rated for your temperature range. The K type I ran on my w123 for EGT was like $12.

RE: Using cluster temperature display to show EGT? - Matej - 06-24-2015

So all the thermocouples of the same type will give the same readouts (ideally), thus in theory the Mercedes sensor should be able to convert the signal to the correct temperature as long as the same type is used?
Thanks for the advice, this is all new time.
Guess now I just need to figure out how to identify which type the Mercedes thermocouple is.

Then I can test it by touching the thermocouple on the stove to see if the module can even display numbers that high. Smile

RE: Using cluster temperature display to show EGT? - Matej - 06-24-2015

Never mind. Upon further research it seems that the stock sensor can show temperature up to 136°F. Guess I will have to go with a regular EGT gauge after all. Smile

RE: Using cluster temperature display to show EGT? - Simpler=Better - 06-24-2015

Auber instruments are cheap (~$60) small, have an alarm light, and an alarm output (that can be hooked up to an audible alarm, solenoid to cut fuel, etc.)

RE: Using cluster temperature display to show EGT? - Petar - 06-24-2015

If you could find a digital EGT gauge that would fit instead of the stock temperature display that would be cool. Or use an arduino with a thermocouple interface and use the stock LCD for display

RE: Using cluster temperature display to show EGT? - raysorenson - 06-25-2015

The temp sensor is a thermistor.

RE: Using cluster temperature display to show EGT? - Simpler=Better - 06-26-2015

(06-25-2015, 04:16 PM)raysorenson The temp sensor is a thermistor.

Then measure the current one, and get one 10x higher resistance.  So that the output iwll read 80*F at 800*F, 110*F at 1100*F, etc.

RE: Using cluster temperature display to show EGT? - raysorenson - 06-26-2015

I don't think there's a thermistor that can handle the heat.

RE: Using cluster temperature display to show EGT? - Matej - 06-26-2015

Indeed. Already looked into it and there does not seem to be one. Too bad, because using one with a 10x higher resistance is a really clever idea. Smile

RE: Using cluster temperature display to show EGT? - Petar - 06-26-2015

Rube goldberg idea: designe something that will heat the stock sensor to corresponding temperature for a given EGT   Tongue Idea