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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

Tachometer Intermittent

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Old Mar 31, 2018 | 01:24 PM
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Hfrazier1's Avatar
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Tachometer Intermittent

Hello, new to the forum here . I have a 1997 F250HD 5.8 manual transmission truck where the tach does not work on startup, but after awhile (5-10 minutes) it works (or seems to) just fine for a bit then stops working. I did have a bad speedometer, and ABS light on, but replaced the VSS in the rear diff and that cleared up the speedometer and ABS issue. My thought is that there must be tach sensor, but I have no idea where it is located. Any help would be much appreciated. Or other things to check first. BTW the truck runs great no other issues I am aware of. Thanks!
 
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Old Apr 1, 2018 | 04:25 PM
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The tachometer gets it's signal from the negative side of the coil. If the engine is not missing then the issue could be the wiring or the tachometer itself.

A diagram for reference:
 
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