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Re: KPH Speedometer
2ManyTrucks #1341633 Sun Jan 12 2020 12:04 AM
Joined: Jun 2011
Posts: 3,603
Shop Shark
Change gears in speedo reducer.


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: KPH Speedometer
2ManyTrucks #1341642 Sun Jan 12 2020 12:44 AM
Joined: Mar 2010
Posts: 9,393
Master Gabster
My bet is that those speedometers read kilometers per hour on the needle, but miles on the odometer, which means that nothing under that KPH dial is different than the speedometers which we have with MPH and miles like Jesus did in the Bible.

Re: KPH Speedometer
2ManyTrucks #1341927 Mon Jan 13 2020 07:03 PM
Joined: Aug 2018
Posts: 387
Shop Shark

the dial face cleaned up reasonably well, i'm gonna use it as is, it will match the other aged instruments in my truck
the photos attached are "cleaned.jpg" this is the result of 48 hr room temperature soak in Evaporust cleaner, then gently rinse with cold water and massage any particles off with fingers only not even a brush.
then it air dried well for a couple days
"coated.jpg" is after i applied a thin coat of Rustoleum satin clear to help stabilize the surface to lock everything in place and prevent new rust
the back side will get a new coat of plain white

i'm gonna definitely check out the odometer later to compare to the 0-90 MPH cluster, i suspect it will be in miles
but i'm curious now to see if i could find appropriate gears to turn it into a KPH odometer. gonna put a pin in that idea

Attached Files
cleaned.jpg (201.33 KB, 171 downloads)
coated.jpg (235.11 KB, 170 downloads)
Re: KPH Speedometer
2ManyTrucks #1341932 Mon Jan 13 2020 07:27 PM
Joined: Nov 2005
Posts: 5,746
3B Offline
Master Gabster
Hy 2ManyTrucks, back when Canada metrified there were speedometer adapters being sold to make our speedometers read in Kilometers per hour rather than miles per hour. I bought a couple of them, but I only installed one, I have another brand new one around here somewhere.

Re: KPH Speedometer
2ManyTrucks #1341942 Mon Jan 13 2020 07:59 PM
Joined: Jul 2014
Posts: 225
Shop Shark
Old British motorcycles, of which I own several, used Smiths spedo drives that came in Mile and metric flavors. Miles units resulted in 1000 revs per mile and metric were 1600 revs/mile. The standard for miles on US spedos is 1000 revs/mile. Speedo shops have or can get adapters that are used on trucks when axle ratios are changed. They come in many ratios. So there may be one for a metric conversion.

51 3800 PU, 55 235 (w/cam, headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.
Re: KPH Speedometer
2ManyTrucks #1341944 Mon Jan 13 2020 08:09 PM
Joined: Jul 2000
Posts: 1,023
Shop Clutterist
Tommy has the answer. Spin the speedo thru 1000 turns by hand. If it added 1 unit, the odometer is in miles. If added 5/8 of a unit, the odometer is in km.

1954 1/2 ton 235 4 speed
Re: KPH Speedometer
2ManyTrucks #1342598 Fri Jan 17 2020 07:53 PM
Joined: Aug 2011
Posts: 19
New Guy
Well it could be that the speedo itself is the same on both sides of the border, the printing on the face of the speedometer is placed differently.
Just a thought

Re: KPH Speedometer
2ManyTrucks #1342764 Sun Jan 19 2020 12:32 AM
Joined: Jun 2008
Posts: 315
Shop Shark
Very interesting, thanks for sharing. I am guessing the odometer is in kilometres.

Re: KPH Speedometer
2ManyTrucks #1342767 Sun Jan 19 2020 01:18 AM
Joined: Aug 2018
Posts: 387
Shop Shark
i measured the odometer
it appears to be in Km!

i turned it about 60-65 times to get the tenth to move one whole unit
so that means it would be about 600-650 turns to get 1 unit increment on the odometer

if the truck cable from the transmission is indeed 1000 turns per mile, then it is also 621 turns per Km
since this odo counts up 1 with 600-650 turns that means it will count 1 Km on the odo with a cable turn rate of 1000 turns per mile.


Re: KPH Speedometer
2ManyTrucks #1343110 Tue Jan 21 2020 02:38 PM
Joined: Nov 2000
Posts: 1,958
Shop Shark
Here is a YouTube video of a cool 1951 with Uruguay license plates. About 40 seconds in you can see the KPH speedometer. The truck has some other interesting features.

Your gauge face turned out great. Good work.

Professional Novice
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