I compared my ScanGauge WT numbers to the CMax water temperature gauge. It turns out that the bottom line on the CMax WT gauge represents 140 degrees F. The middle line represents 178 - 211 degrees F (211 was the highest I could get the ScanGauge to go to at 80mph on the highway! and ruined the c**p out of my mileage!). I do find it odd that the gauge did not move for 31 degrees. The outside temperature was 54 degrees F, Wednesday we are to reach 63 and will try again. Keep in mind that I have both grill covers installed. I mentioned earlier about the Hotline Assistance Request and here it is: To emphasize "The thermostat is fully open at 202 degrees, so normally the engine should be approximately 202-212 degrees (again depending on the conditions present and if the engine is operating at that time.)" A 50/50 mixture of water/coolant at 21 psi boils at approx 285 degrees F. Note: The coolant reservoir cap has 21 psi stamped on the top.