IR temp guns are nice and all that but here's what it comes down to, you need to be concerned with the max head temp and thats going to occur when the engine is loaded doing tic tocs or whatever. A venom temp gauge is nice because you can recall the high and low temp from a given flight. You should be looking for a max temp 220 or below, I run mine not to to over 200, just isn't worth it for me for the extra wear on the engine. Even if the temp is 200 or 205 max, by the time I land and look at it the gauge is reading in the 180's, which if you measured after the flight would lead you to think you had some room to go leaner when infact under load you were already *****g out or nearly so.