I'm getting ready to put together my home-brew engine monitoring system and came to a realization. My 912UL is an older one that has cylinder head temperature sensors and as such do not actually contact any fluid. It appears there is no provision for a direct reading of coolant temperature on this engine. Granted I was looking at the engine in my dimly lit barn addition. So the question is on these older engine with the CHT in the bottom of the #2&3 cylinder heads, is there or should there be another sensor for reading the actual coolant temperature? If so where should it be/go?