100 Mph cluster

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Feb 24, 2012 | 10:34 AM

#16

Bullitt390

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Quote:

Originally Posted by psquare7575

I've had this for over 10 years with no problems. There is no gear changing in the transmission necessary, as all the Ford speedos turn the same. its the internal gearing that changes the face calibration.

Not to be the tech police, but the speedo works off hall-effect magnets... The odometer is geared.

Josh

Feb 24, 2012 | 10:52 AM

#17

psquare7575

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From: MA

For the purposes of this discussion, it could work off the magic dust sprinkled by a gnome who climbs into my truck while I sleep for all I care.

Feb 24, 2012 | 11:02 AM

#18

Bullitt390

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Somebody got up in the wrong side of the bed today...

Josh

Mar 28, 2012 | 09:08 AM

#19

GOVTMOD

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From: Southeast Salt Lake, UT

Quote:

Originally Posted by Bullitt390

Not to be the tech police, but the speedo works off hall-effect magnets... The odometer is geared.

Josh

OK, I believe you are saying that although the the speed will read correctly the miles will not, correct? Wouldn't it be counting the miles too fast, 17.6% too fast or 1 mi when you've only traveled .85 mi, in fact? I just pulled the cluster out of my 79 because the speedometer wasn't working. I found a 100 mph head at a local wrecking yard. Turns out it wasn't hooked up at all but I'm still thinking of swapping the heads.

Mar 28, 2012 | 09:41 AM

#20

psquare7575

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Negative. It will be fine.

Mar 28, 2012 | 10:06 AM

#21

GOVTMOD

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From: Southeast Salt Lake, UT

BTW the 100 mph head I have has the high beam jewel.

Mar 28, 2012 | 10:34 AM

#22

GOVTMOD

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From: Southeast Salt Lake, UT

Quote:

Originally Posted by psquare7575

Negative. It will be fine.

OK I was looking at the head and I see that everything should be calibrated within the head.

Mar 28, 2012 | 01:22 PM

#23

GLR

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From: NY and VA

psquare, like those white face gauge background.

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Mar 28, 2012 | 03:25 PM

#24

Pickupmanx2

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From: Near Yosemite CA

I swapped to the 100 mph in my 77 from an 85,, and according to GPS,, all is good,,, now when I went to 33's THAT changed the speedo!!

Mar 28, 2012 | 03:30 PM

#25

Blown 331

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From: Waterloo IL

Quote:

Originally Posted by Pickupmanx2

I swapped to the 100 mph in my 77 from an 85,, and according to GPS,, all is good,,, now when I went to 33's THAT changed the speedo!!

I've never heard of that being done. Can you post a pic?

Mar 28, 2012 | 08:36 PM

#26

Pickupmanx2

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From: Near Yosemite CA

Of the 100 mph speedo? I think it came out of a van,,,

Mar 28, 2012 | 08:40 PM

#27

Blown 331

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From: Waterloo IL

I mis-read. When you said it was "from an 85". I thought that meant from a 1985, I just realized it meant from an 85mph. lol.
Yeah I've seen the 73-77 100mph units, I've got a few. My bad.