I think that idea may have been scrapped, since it means the computer is always getting a falsely (colder than true) signal.
Far better, in my opinion, to figure out why the unit is running hot, and be glad you now get notice before you cook something. (and beat the operator for letting his foot ride on the inching pedal).
By the way, electricity travels at the speed of light, so the -time- differences between the signal running through the resistor and not running through the resistor is not why adding the resistor works, it is because temp senders work on how much resistance is created by the temp change in the sender, and adding a resistor increases the amount of resistance the same as if the sender was cooler than actual, so the computer "sees" a colder signal than is actual.