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Adding Additional Coolant Temp Sensor on M54

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    Adding Additional Coolant Temp Sensor on M54

    Just completed M54B30 swap into my E30. Going to run a Holley standalone dash that I have already purchased. Installation of dash/gauges is simple but I need some advice on where to install an additional temperature sensor. I would prefer not to put it in the radiator as I would like to get engine coolant temperature and not radiator coolant temperature. I need to retain the original sensor under the intake for my DME. Anyone have any thoughts or suggestions? Many thanks in advance.

    #2
    I've also been thinking about this. I want to run a separate water temp gauge, but need a place to tap into.
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      #3
      I think the 5 series E39 has a temp sensor the same size and spec which is a dual sensor. You could replace the existing one and have the second output for the dash

      PN's: 3148100001 and 12521703571

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        #4
        Originally posted by furio-james View Post
        I think the 5 series E39 has a temp sensor the same size and spec which is a dual sensor. You could replace the existing one and have the second output for the dash

        PN's: 3148100001 and 12521703571
        ORLY?

        Great find! Try 13621703993 ("Double Temperature Switch") for the sensor, though. 12521703571 is correct for the pigtail

        https://www.realoem.com/bmw/enUS/par...&q=13621703993

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