well technically the right ay to tune your engine for performance, not so much for temp. during the break in if you just leave the needles at the factory setting the engine will not over heat. if it does over heat then you have a lean condition going on and you may have an air leak in the fuel system, exhaust system or carb. the only adjust you should need to make during break in is to the idle screw to kee it idling properly as the engine breaks in the idle wll change. once break in is done you tune for performance and not for temp. you''ll never get it to run at a certain temp. after a lot of high speed runs your temp will be pretty high possibly in the 260 or 270 range. all the electronic monitoring stuff is pretty much useless for the most part. the on board temp monitoring is nice because youcan see what the temp is, but you really want to for performance and sound.