Jerry-
The 5 mile distance must be standard as that's the same method I used to set
up a truck that had Moon gauges with an electric speedometer.
I do recall reading an article somewhere that showed a chart with gear
ratio's and tire diameters. I guess it's time to pull out the stacks of
Magazines? I want to say the article was based on United Speedometer Co.
Joe Garcia
Yuba City, CA
1950 Chevrolet 3100
http://chevy1.freeservers.com/
http://50chevy.freeservers.com/
http://1950Jeepster.freeservers.com/
-----Original Message-----
From: Jerry Balcom <jbalcom@earthlink.net>
To: oletrucks list <oletrucks@autox.team.net>
Date: Friday, December 01, 2000 6:04 PM
Subject: [oletrucks] electric speedo calibration
>Maybe someone out there knows the answer to this one or can steer me in the
>right direction to find the answer. Just bought a Stewart Warner 5"
electric
>speedo (for alot of reasons, one of which was to be able to recalibrate to
>handle the non-stock drivetrain). My '49 3600 is pushed by a turbo 400, a
>10" posi with 2.73 gears and a pair of 255-70x15 meats. The calibration
>instructions are based on mounting the speedo, driving a measured 5mile
>length of highway, calculating any discrepancy with this distance on the
odo
>and finally finding a cross reference in the supplied table (you then get
to
>repull the speedo to reset the "code"on the back of the speedo before you
>button it all up once again). I called the "engineer" at SW tech support
to
>find the final drive gear ratio that the unit is factory calibrated for so
I
>could just recalculate mine based on the above parameters and set the
speedo
>before I mounted it. He told me that was impossible to do and that they
>don't know what the speedos are set for, just how to adjust them if they
>don't measure the prescribed 5 miles. Is this really rocket science? (Or
>maybe more like reading tea leaves.) Anyone know how to work out this
>calibration or am I out in left field? Thanks for any help available.
>Jerry B.
>'49 3600
>oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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