Car engines and plane engines are basically exactly the same, the difference is that a plane engine always has a load on it from the prop while a car engine only has a load on it while it's being driven. That's why it's so easy for us to tune a plane engine to get a rich or leaner setting instantly without having to resort to measuring head temps (which are only a guide anyway) after a quick run around. Don't worry about engine temps because so long as it's not run too lean then the temps will be what they will be and there's nothing that can, or should, be done about it.

Personally I think the limiter is a stupid idea because there's a huge difference in where the needle should be set depending on how much nitro you have in the fuel. If they said to use an 11x4 prop and 15% nitro (to pick some figures) then it might work. Otherwise it's useless.

BTW, my son went from planes to cars and he ran in his car engine starting from a 4 stroke in flat out running (he knew what sounds to listen for) then gradually leaned it out to begin building up more heat and now it howls.