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Discussion Starter #1
Had a new problem pop up today. When idling at a light, the coolant temperature and oil temperature gauges read middle of the road, as they should. However, when traveling down the highway, both gauges drop nearly to the bottom of the range. When we slow back down at a light, the guages start to climb back up to the correct place.

Do both of these gauges share any connections I can start with checking or is this an early sign of needing a new or rebuilt cluster? The wiring diagram in the back of a Haynes manual doesn't show the SVT-specific gauges.
 
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