Temp gauge

Hello everybody, have fitted 2.5na into my series 3 and have just one small problem to solve. The temp gauge does does not work with the defender temp sender. I have a sender from original 2.25 petrol engine but the threads are different. Anybody solved this problem. Thanks for your help.

At first thought I'd have a look at the resistance at room temp/boiling water on both sensors and see what the resistance difference is. Could be the 2.5 sensor you have is just bad. If they're close then it should work - there's nothing magic about the sensor in the circuit.

If they are wildly different i'd be looking for a thread adapter from one thread to the other - as long as a decent portion of the bulb from the sensor is exposed to the coolant it should work fine.

Are the threads on 2.5 same as 200tdi if so this is supposed to be a good match for a series gauge AMR1712.
See this thread from elsewhere
200TDi temp sender (again)

no, i have the same problem, i have a 200tdi in a series 3, and could't get temp gauge to work,the temp sender on the 200tdi has a very fine thread i think its 5/8 bsf, i ended up buying one of the capillary one's the thread was still different but managed to get an adapter, tried it and that doesn't work, so still got no idea of what the temp is, i would love to no how to get around this surely all the 200tdi conversions that there are somebody must have found a way

Check the sensor. I have a 2.5na and use the standard sensor with no problems.

Problem solved Steve parkers have a conversion kit for using a series 3 temp probe. Cost 10.00. I think it can also be used in a 200 tdi conversion.

Many thanks for your help.