Easy, get the Oznium Scion OEM style rocker switch. I use 2 of them on my 4runnerm one with the green LED and one that doesn't have an LED. They fit into the blanks and look stock.
You can see the one without an LED in this photo that I took for an unrelated project.
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I don't have any good photos of the one that I have fitted with an LED, but the listing I posted is accurate. I use it for my fog lights, no complaints. By 3 lead you mean it has 3 shovel connectors on the back (one for the LED ground)? The LED version is that.
I'd like to know more about how you did the thermometer add on!