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Old 05-16-2008, 08:49 AM
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1987 300E
 
Join Date: May 2008
Location: Central NJ
Posts: 60
Tach doesn't work. Without just throwing new parts into the car I'm trying to find the best way to isolate the problem. I've been looking for ways to test the tach and/or measure output from the rpm sensor when I came across the above from previous posts.
Are we talking about 2 different things? I take it the crank sensor is different from the rpm sensor, or better yet, whatever the unit is that sends a signal to the tach.
The car runs fine other than the tach not working. After doing some research here I've found that usually there are other symptoms if it's the OVP. So touching an ohmeter's leads to the tach directly will not give me an indication of it working?
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