It depends if you are talking about gauge temperature, or EFI water temperature, or other water temp sensor for the thermo fans or whatever.
The one for the temp gauge is just a single wire type. They are generaly all the same and interchangable. But there to too sizes, big threads and small tapered thread.
For the EFI temp sensor, I believe they would all work and be interchangable, except the plugs are different. The early 4A-GE (bigport) sensor has a square plug. The smallport 4A-GE uses a different Toyotaish plug. The 20valve one is a different part number, but I think it is basicaly the same as the smallport one. Maybe the plug is different again, but the threads are the same.
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