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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Bouncing tach

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Old Oct 8, 2016 | 12:48 AM
  #1  
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Bouncing tach

91 f150 302

My tachometer was bouncing all the way back from California every time I went over 2400 rpms it didn't seem to do it if I just revved it in neutral

The check engine light kept coming on but always went back off I assume they're connected
 
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Old Oct 8, 2016 | 06:22 AM
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From: Easton,Ks
Loose items on the board of the tachometer.
Replace Tachometer or re solder the part on the board.

Here is a video:

/
 
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Old Oct 8, 2016 | 11:45 AM
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Our tachs are doing two different things mine drops 50 or so rpms at a time once you get to a high rpm I feel its not the tach since as far as I can tell it's still accurate to that point
 
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Old Oct 8, 2016 | 12:29 PM
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My spark is dark orange if that matters
 
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Old Oct 9, 2016 | 09:34 PM
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It was the module causing it

It could also be the pickup and replacing the module was like a bandaid for it but well see
 
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Old Oct 11, 2016 | 12:02 AM
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A bit unrelated here but what's it take to lube up the speedo cable I keep eating gears 10,000 or so miles on the last set

It's got a 1345 in case someone knows where to get a new gear for less than $60
 
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