Due to the simplistic design of my air cooled engine the cooling performance isn't as good as a liquid cooled engine and there is no way to tell if it is overheating until it catches fire, explodes or seizes up. I was thinking about adding some sort of temperature sensor to my engine so I can keep an eye on the temperature or perhaps add a micro controller to give a visual warning when the temperature is too high or even engage the kill switch when the temperature gets critically high. My question is where would be an easy place to mount a temperature sensor but still get accurate readings and what temperature would be considered dangerous.