Unless someone has added an additional form of pre-heat, I would tend to go with your first guess, that the temperature sensor is wrong. How does the dash engine temp gauge compare with the VMSPC when the engine temp starts to get up around 100 degrees? The dash gauge and the VMSPC are feed off of separate sending units, one on each side of the engine. Trouble is the dash gauge bottom number, at least on my coach, is 100 degrees.
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