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  #1  
Old 01-14-2008, 09:10 PM
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Tachometer nonfunctional on an 85 300D

My tach simply doesnt work. I have searched around and haven't found much information on fixing this. If we can get a list of things to check for any ways to troubleshoot perhaps we can make an informative tachometer troubleshooting thread as well as helping me get mine working!
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  #2  
Old 01-14-2008, 10:35 PM
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Is your car a CA model?
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84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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Old 01-14-2008, 10:43 PM
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in 85 ca and fed were identical... so it does not matter.
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Old 01-14-2008, 10:48 PM
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Here are a few threads to read:

This one has a lot of information on both CA and Fed cars:

1985 300D CA Emissions Tachometer repair

This is a thread on my troubleshooting my 1984 tach problems:

Figured out why my Tach won't work...
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Old 01-14-2008, 11:28 PM
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Quote:
Originally Posted by vstech View Post
in 85 ca and fed were identical... so it does not matter.
They are far from identical. The CA has a trap oxidizer and different emissions components including an emissions computer. I used to own one and even have a specific supplement shop manual for the car.
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84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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  #6  
Old 01-15-2008, 08:22 AM
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Two things to check......
OVP (overvoltage protection relay), right knee bolster panel under glove box, known to fail after many years. Easy to replace, always keep a spare in glove box.

Tach pickup on bell housing above flexplate. It's magnetic, clean it up.

Alan
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  #7  
Old 01-15-2008, 11:06 PM
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Little known fuse hidden behind glove box could be blown.
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Old 01-16-2008, 12:30 AM
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Quote:
Originally Posted by lietuviai View Post
They are far from identical. The CA has a trap oxidizer and different emissions components including an emissions computer. I used to own one and even have a specific supplement shop manual for the car.
I'm pretty sure he is only talking about the tach set up.....

My '85 tach has sat on 0 since I've owned the car. I've replaced the EGR computer, tach pickup, OVP relay. I doubt it's the gauge but I will swap that sometime when I'm around somebody with one.
Good luck with all that......
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Old 06-30-2008, 04:51 PM
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can someone post a pic of the overvoltage protection relay on a w123 and its exact location please.
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  #10  
Old 06-30-2008, 09:44 PM
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Did you see this thread ?
1985 300 D Tach Problem
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