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52mm Tach question 200

Does anyone else who has a 52mm tach typically see a high RPM at idle?

Mine reads ~975rpm at idle, though during emission testing last week, the spark pickup was reading ~760-775rpm. Is this endemic to the 52mm tach, or is mine just off a bit? I didn't look at it during the 2500rpm test to see what it was reading, so I can't comment on higher rpm accuracy.

Zach Zaletel
Anchorage, Alaska
1990 245DL with 245k mi, and a snazzy new red hood! Back on the road.






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