I spent many years as a Pow.Eng. and in that capacity measured temps of all kinds of fluids. Under most condition the temperature probe was in the fluid--of course. But there is a temperature relationship between the gases and the air adjacent to the fluid that remains somwhat constant. Once this relationship-or ratio- is established your have your answer. Stick a thermometer into the oil just after a good run- then quickly reinstall your temp gauge. If you find the gauge is 5 degrees lower than the oil itself, than will be a resonable constant you can rely on. Of course we would all agree that an immersion temp. gauge is the ideal.
Blue
