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Speedometer Accuracy

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Averyman:
I was out cruising today and the speedometer read 40MPH at a nice cruise and I could top out at 50MPH.  It SEEMED like I may have been going 50MPH but I had no way of telling if I actually was.  Does one have to do an adjustment to the indicated reading or is the speedometer indicating the actual speed?  I don't see anything in my Operators Manual about this.
Clarence

Swamp Dawg:
Nice way to double check your speedo is with a GPS. 

Cranman:
If your spedo is original I believe they read double until late 1953 when the model change was made and a different gear was found for the newer type speedo.

grfishmaker:
 OK, Here's a question. I have a 1953 machine, it now has a Ford 300 6cyl. and a 3/4 ton differential installed. I has its original speedometer on the bash with no speedometer cable hooked up to it.  What kind of cable will I have to install and will it be accurate without changing the dash indicator? Is there some sort of gear reducer/increaser that has to be changed to match the sproket speed with the dash speedometer indicator?
 I have used a gps, but it would be nice to have an operating speedometer for convenience sake. If I had an external antenna for my gps it would also make my life easier.
 Thanks for any suggestions anyone may have.

Averyman:
Cranman -  Spedo is origional and your answer makes sense, 25 MPH is likely closer to top speed.

Grfishmaker - Good question and sorry I have no idea of the answer. If that engine/diff was actually origionally used in a Bombardier then perhaps someone like Dan Shaver could help. His Phone # is 204 467 2605

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