I actually put mine inline on cooler return. Idk how much difference would be between the pan and line back to cooler. If I ever get a bung installed I would like to compare the difference in temperatures
Return cooler line oil is the most accurate for determining true trans temp Or to put it another way ..... This is the temp that should concern you. Oil in pan is "stagnant" oil and doesn't represent true discharge temp which is whats concerning.