Where is your probe? It could be in the upper outlet from the head to the radiator, but is more commonly in the lower inlet to the block.
If in that lower position, it will take a lot more and longer work than you're giving it for it to register much on the gauge if at all. That thermosiphon is an amazingly effective system -- a lot of radiator and a LOT of fan on a small system. On mine, I have to cover the grille to get it it to even warm up on a short run. At the end of the run, it will be hot enough on the top tank of the radiator to be uncomfortable to touch. The bottom (Where your temp probe likely is) will be quite cool.
You can stick a thermometer in the filler neck to see how warm it is at the top aftr running a while. But warm at the top and cool at the bottom indicates a good cooling system. A thermosiphon uncomfortably warm at the bottom would be a sign of possible blockage or restricted flow.
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