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| Hazza Member Since: 10 Jan 2011 Location: North Yorkshire / Leeds Posts: 241   
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It's possible to drill and tap a hole into the same housing as the standard sensor. I have a Durite guage with it's sensor located here.
It does sound like you're getting strange readings on the standard gauge 1990 Defender 110 200TDI Camper - now converted to Td5 power |
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29th Aug 2025 2:11pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 6006 
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As you know the gauge is not really that accurate but I believe the sender is, and you can use a nanocom or similar to see these reading in degrees C whilst driving.
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29th Aug 2025 2:34pm |
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| TexasRover Member Since: 24 Nov 2022 Location: Paris Posts: 1338  
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The gauge designed to appease our human mind. It stays dead center over a large (acceptable) temperature range and then goes full hot when too hot.
When I got my Td5 there was an earth issue somewhere and every time the AC compressor kicked in it would increase the temp gauge to where it would read almost in the red to then revert back to dead center with the compressor off. Although it was clear there was an electrical fault and a logical correlation it was still unnerving to see the temp gauge read high. Nanocom will read you the real temperature and you can see it fluctuate. I believe there are gizmo's you can get that read the OBD2 code and display the figure |
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29th Aug 2025 3:15pm |
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2231  
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I have a GORE block, replaces the stock one and gives another hole for an additional sensor. However they are no longer made. I believe you can get some sandwich plates that give you a 1/8npt hole for an additional sensor.
Or its the old school method of cut the top hose and fit one in there with the help of a universal adapter. You need to keep the original sensor to keep the ECU happy or it will constantly think its overheating. |
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29th Aug 2025 3:51pm |
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| M.teague Member Since: 28 Aug 2025 Location: Kernow Posts: 6 
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Thanks for all the replies and advice, its appreciated
I have a 2.5na in my 2a109 which i am o.kish with but the td5 is a whole new learning curve so i expect to be seeking a fair bit of hands on info, Atb |
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30th Aug 2025 2:51pm |
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| MadTom Member Since: 10 Sep 2013 Location: Olomouc Posts: 687  
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You can also remap the engine ECU, so it will work like standatrd thermomerer, not like an "indicator for human". Bigger problem is, when you loose cooling fluid from engine, sensor is not submerged in coolant and cannot measure any valid value. So for me more important is some coolant level indicator, than accurate thermometer. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo
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30th Aug 2025 8:18pm |
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| DefenderCan Member Since: 25 Nov 2023 Location: Canada Posts: 33 
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As mentioned, a Nanocom would be a better investment than adding another gauge, along with all the other nice features it offers. I have one myself. Only gauge that is worth your buck would be a EGT monitor.
The coolant gauge will rest in the middle once the coolant reaches, I believe 70ish Celsius up until 115 Celsius. It will only shoot in the red once it has overheated which is 115+ Celsius. |
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19th Sep 2025 7:42am |
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