Thermometer sticker placement, radiator or cylinder?

Ijust ordered some factory effext temp stickers for my 08 yz450f. I hsve engine ice in the radiator, but I'm one of those paranoid people. I've never seen it boil over,but it's been pretty cool weather since I've owned it. Where should i place that sticker for the most accurate way to tell if it's overheating? I think I've heard my coolant boil but not sure. Ive heard air escaping from my radiator when it gets hot but I've never seen it boil out the cap. Thanks for any help!

The top tank of the left radiator will give you the most accurate read of coolant temperature leaving the engine.

Thanks!

The stickers are cheap....why not put one in both locations?

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