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tach ?

xray

NAXJA Member #1056
Location
wisconsin
Some times my tach will work normally, then sometimes it will jump up and read a much higher reading for awhile. it is in a 89 4.0. Could it be a short or might it be a problem with the tach itself?
 
Its just the tach. Ill just be driving and the tach will jump and go to more than twice the rpms, sometimes it stays like that for quite some time.
 
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