This morning when my girl started her car up, she said the tach "wiggled all weird" and jumped straight to the top of the gauge. The engine speed didn't change at all, and shifting into gear made no difference in the tach reading. Turning the car off causes the tach to drop back to zero. Occasionally it will read correctly for a few seconds, then smash back up to redline. Whiskey tango foxtrot is going on here?
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