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The ScanGauge also stores your maximum coolant temperature encountered in the current drive - perfect for putting your mind at ease if working on a partial grille block. (Though you still need to listen or wire an LED to know when your electric cooling fan is coming on - since you don't want it running much to compensate for an overly-aggressive block.)
Also, there are less expensive options than the full SG2 - ScanGauge E, UltraGauge, etc.
Pale is spot on with advice on looking at more aerodynamic modifications, since you spend the majority of your driving on the highway.
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