Tach sensor placement??
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Senior User
Joined: May 2010
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From: Oregon
anyone? its like it is 2000rpm off or something. if i rev it, the needle moves up and goes back to 0 as i let it cool down. just isn't reading, bad cluster? bad connection?
IDK where to look. its a new sensor from ford was in a bag n all
IDK where to look. its a new sensor from ford was in a bag n all
Hotshot
Joined: Jun 2003
Posts: 12,350
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From: SW VA
I'm glad I saw this thread. I am having the same exact problem with my '88. At idle, it will read 0 to 250 (bouncing), and while driving she will bounce between 100-1000. Mine doesn't have the sensor in the IP gear housing either... 
I really need to know what my RPM's are, as some moron installed a shift kit when the trans was rebuild a month before I bought it, and it is not shifting right at all. Sounds like she's turning 4k before it shifts...
I really need to know what my RPM's are, as some moron installed a shift kit when the trans was rebuild a month before I bought it, and it is not shifting right at all. Sounds like she's turning 4k before it shifts...
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Senior User
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From: Oregon
looks like its just bouncing if you dont have the tach sensor in.. automatics need the tach sensor afaik... something about limp mode vs something else
I've added a tach sensor though and now mine reads 0 unless im haulin but then it'll go up but way under what it should be.
I've added a tach sensor though and now mine reads 0 unless im haulin but then it'll go up but way under what it should be.
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Joined: Feb 2007
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From: Pukalani, HI
I'm glad I saw this thread. I am having the same exact problem with my '88. At idle, it will read 0 to 250 (bouncing), and while driving she will bounce between 100-1000. Mine doesn't have the sensor in the IP gear housing either...
I really need to know what my RPM's are, as some moron installed a shift kit when the trans was rebuild a month before I bought it, and it is not shifting right at all. Sounds like she's turning 4k before it shifts...
I really need to know what my RPM's are, as some moron installed a shift kit when the trans was rebuild a month before I bought it, and it is not shifting right at all. Sounds like she's turning 4k before it shifts...
Hotshot
Joined: Jun 2003
Posts: 12,350
Likes: 4,384
From: SW VA
If you have the stock tach then it should have the stock sensor to work. It would take a lot to fab someone elses sensor to run the Ford tach. On your '88 is it running the C6 or E4OD? The C6 won't care if the tach works or not, the E4OD will have fits if anythings wrong....
I still have not crawled under the truck to see if there are magnets on the crank pulley/harmonic. Dang thing won't start so I gotta figure that out before I work on the tach...
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Senior User
Joined: May 2010
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From: Oregon
if ya got fuel, air in the intake, batteries/start, and glowplugs it'll start.
bump for progress on mine - i went mudding today hit some hard bumps and now the tach wont register at all. I figure its a short/corroeded wire so I'll rewire this shiz.
bump for progress on mine - i went mudding today hit some hard bumps and now the tach wont register at all. I figure its a short/corroeded wire so I'll rewire this shiz.
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From: Oregon
old thread, but i found out that there was a connector for the tach tucked into the fender. I got a used tach sensor and it works sometimes, accurately.
So now I gotta figure out if the cluster has a bad ground or bad connection between the sensor and gauge
So now I gotta figure out if the cluster has a bad ground or bad connection between the sensor and gauge
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