Tach reads too high - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 09-15-2013, 09:14 AM Thread Starter
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Tach reads too high

Hey guys..just got this truck a few weeks ago. The tach has always read about 1k too high. Don't know how or why this would've happened.
Original rear end, original miles...tach reads high even when shut down.
Is there any way to recalibrate it or am I looking at a whole new gauge cluster?
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post #2 of 11 Old 09-15-2013, 09:19 AM
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Junkyard would be my option. You may want to take it apart, could be something that is stuck in there not letting the needle return to zero, worth a look any way.

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post #3 of 11 Old 09-15-2013, 10:08 AM Thread Starter
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Thanks..here's another pic. I'm in overdrive and doing the speed limit

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post #4 of 11 Old 09-15-2013, 10:41 PM
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It looks like the needle spun on the shaft. Try pulling the needle off and putting it back on at the 0 position.

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post #5 of 11 Old 09-16-2013, 03:32 AM Thread Starter
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That sounds good to me...is there a way to do that without pulling the cluster? Perhaps simply pull the clear plastic somehow?
Just looking for the least heavy-handed approach here :-)

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post #6 of 11 Old 09-16-2013, 06:39 AM
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This could be a very easy fix so don't buy anything until you check it out. I don't know about accessing the needle, I have always just pulled the cluster to replace bulbs, itisn't that bad.

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post #7 of 11 Old 09-16-2013, 10:39 PM
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The cluster is really easy to pull, iirc it's 4 screws then just unplug 3 harnesses on the back of it.

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post #8 of 11 Old 09-17-2013, 06:04 AM
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MANY YEARS AGO, while working at a Used Car Dealership, we did this All the time (to "clock" the OD)

The clear cover comes off to expose the dials & needles. You put your thumb/forefinger on either side of the needle, on either side of the pin it's attached to, and roll-up to pull it off (it's just press-fit). They just come off! Then, press it back on "zeroed". I don't know why it would move in the first place, something slipped, maybe it's inside on the wheel, I'd try it and see if it happens again and then consider a drop of "Crazy Glue" maybe...

Also, make sure your hands are Really clean, finger prints on that stuff looks obvious later...
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post #9 of 11 Old 09-17-2013, 06:40 AM Thread Starter
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Wow, great info..thanks everyone!
Ralph, what did you mean by "clocking the OD?"

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post #10 of 11 Old 09-17-2013, 08:03 AM
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Yea, that ain't OverDrive
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