Speedometer face question...

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May 4, 2016 | 08:13 PM

#16

kr98664

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Quote:

Originally Posted by 1986F150six

They are on all 1980 - 1986 speedometers, regardless of engine, transmission and differential variables.

Just curious, what about metric speedometers for trucks sold outside the US? Do they have the same set of hash marks?

Also, what about pre-1980 trucks? Did they have similar marks? If so, there may be some documentation describing their use.

May 4, 2016 | 09:15 PM

#17

82F100SWB

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From: Dryden, ON, Canada

Had to go and look and then dig into the archives. No such markings on metric clusters.

Had to pull the trim panel in the mud truck to look at this one, it's been hiding behind a tach since 2008... LOL

May 4, 2016 | 09:39 PM

#18

Hound Dog Lew

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Joined: Sep 2015

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From: Richmond, Virginia

I looked at a picture of a speedometer from '87. It too seems to have the "hash marks".

May 4, 2016 | 10:14 PM

#19

kr98664

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Quote:

Originally Posted by Hound Dog Lew

I looked at a picture of a speedometer from '87. It too seems to have the "hash marks".

Curiouser and curiouser... Here's a pic from a '92 F150:

Note the sets of hash marks at 0, 26, and 61. This blows my bean counter vs. tooling theory out of the water.

May 4, 2016 | 10:33 PM

#20

Gary Lewis

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From: Northeast, OK

So, you are supposed to shift out of 1st at 0 MPH? Or, is that 1 MPH.

This is really getting weird. Looking forward to a reasonable explanation, but am doubting we will find it.

Last edited by Gary Lewis; May 5, 2016 at 02:11 PM. Reason: Typo

May 5, 2016 | 12:37 PM

#21

WhatsAChevy?

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From: Northeast Ohio USA

I just sent an e-mail to Bob's Speedometer in Howell, MI.
They have been in business since 1929. Worth a shot.

May 5, 2016 | 02:11 PM

#22

Gary Lewis

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From: Northeast, OK

Good idea!

May 5, 2016 | 08:23 PM

#23

UTlonghrns

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They seem to be on all ford vehicles of this vintage. The fox body mustang has them as well.

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May 7, 2016 | 08:15 AM

#24

Eddiec1564

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Joined: Mar 2007

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From: Arcadia, Fla

Quote:

Originally Posted by kr98664

Curiouser and curiouser... Here's a pic from a '92 F150:

Note the sets of hash marks at 0, 26, and 61. This blows my bean counter vs. tooling theory out of the water.

Those marks are for calibration of the speedometer needle. When I supplied a input sine wave(VSS simulation) at a certain frequency in to this speedo, it will fall into one of those "brackets"

As this is a digital driven needle, I also found there are meter movement programing located in the EEPROM of the PSOMs, none of which can be changed after the factory programs it(unless you know how to...)

May 8, 2016 | 01:11 PM

#25

FordPUMan

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Joined: Jan 2011

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From: Goldthwaite,Tx

I always thought they were shift points but now I'm starting to wonder.

May 8, 2016 | 01:14 PM

#26

kr98664

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Quote:

Originally Posted by Eddiec1564

Those marks are for calibration of the speedometer needle. When I supplied a input sine wave(VSS simulation) at a certain frequency in to this speedo, it will fall into one of those "brackets"

Interesting stuff. Do we mere mortals have access to this "behind the scenes" info, or was it just at the factory or dealer level? Should make for interesting reading for a geek like me.

May 8, 2016 | 01:19 PM

#27

Gary Lewis

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Joined: Jul 2010

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From: Northeast, OK

I was once told "You may be a geek if you know what HTML stands for." To which I replied HyperText Markup Language. So, I'd like to know/read about it as well.