I've got a TrailTech Vapor unit on my GG. It includes a water temp sensor too. The actual sensor is threaded into a plastic pipe (or "Tee"), and the unit is then spliced into the radiator hose. Hose clamps then secure the assembly.
I'd suggest something like that, rather than drilling and tapping the radiators themselves. I'd be cautious of the thin and soft metal of the rads. And if it doesn't work or you need to remove the sensor, all you have to do I replace the hose (or even simply splice-in a piece of hose).
Oh, I forgot to add. I think the KTM rads (which are similar to our GG rads) do have a threaded opening on their top surface.So maybe you can sneak a peek at a KTM rad and copy where/how they accommodate a temperature sensor.
Regards.
Dale
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