FYI, I believe that the GM standard, for years, was 1000 RPMs=60 MPH. This
should translate linearly across the MPH range (i.e. 500 RPMs=30 MPH & 1500
RPMs=90 MPH--RIGHT, downhill, maybe!). I did this using a lab calibrated
strobe light (& cheap electric drill with adjustable variable speed).
Remember that the input to the back of the speedometer (facing it from the
back) is counterclockwise.
Regards,
Doug Pewterbaugh
dpewter@msn.com
Denton, TX
49 3104 216 5-window
----- Original Message -----
From: "Jim Nordwall" <jnord@fgi.net>
To: "oletrucks" <oletrucks@autox.team.net>
Sent: Tuesday, April 24, 2001 11:39 PM
Subject: [oletrucks] RE:speedometer
> In answer to Carlos' last question first. I put the needle back on the
> assembly so it rests at 0, very easy to tell. I am sure the speedometer
> scale is not right. It is going to take some playing around with
different
> gears before I get close. My brother in-law used to repair and calibrate
> speedometers. I also used Corel Photo-Paint to scan the speedometer
> faceplate and will more than likely move the scale around to make it
> accurate before all is done. I also scanned the instrument cluster and
> modified the oil pressure to go to 60 PSI. Printing instrument faces is
easy
> to do with a color ink jet ( or color laser if you got one). Right now I'm
> just happy to have a speedometer again, even if is 30 when I'm really
going
> 40.
>
> Jim Nordwall
> Jacksonville, IL
> 50 3100
>
>
> Original Message
> >Date: Mon, 23 Apr 2001 22:34:03 -0500
> >From: Carlos Madero <cmadero@flavorite.com>
> >Subject: [oletrucks] speedometers
> >
> >Jim Nordwall, thank you very much for the speedometer tip. In the
> >now-defunct Hot Rod Mechanix magazine there was an article about printing
> >"old" faces for new gauges, using Adobe Acrobat or one of those graphic
> >software programs. You still need to get a scale that shows true speed,
> >unless you were very lucky and both speedometers were exactly the same
> >scale? One question, when you replace the needles, how do you put it
back
> >where it needs to be (i.e. calibrated properly)?
> >
> >Carlos F. Madero
> >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
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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