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1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck
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Old May 29, 2009 | 05:21 PM
  #16  
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there it is : the tach is currently showing around 1500 at idle.
 
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Old May 29, 2009 | 05:32 PM
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If your info was correct and you have 3.50 gears and 31" tires then go ahead and take your truck out and go 50mph, if your tach is reading 1,900 rpm's (give or take) then you finally have the tach dialed in.
 
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Old May 29, 2009 | 09:32 PM
  #18  
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Yea it must be off some, does the motor sound likes it's running that fast? Maybe the tachs just defective??
 
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Old May 30, 2009 | 01:40 AM
  #19  
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got it.. turns out i had to go through the installation directions Aagain. tach now shows around 500 at idle and 2000 at just over 50MPH.

Thanks for the benchmarks guys, i had no idea were to start, dam gauge is only as accurate as it is correctly installed.
 
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Old May 30, 2009 | 09:54 AM
  #20  
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Glad to hear you finally got it squared away.
 
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