I had a similar problem with my speedo after adding an OD to a non-OD car.
My understanding is that recalibrating the speedo is relatively easy to do
in one of two ways:
1. Have the unit rebuilt by a professional and ask them to do the
calibration based on your measurement of (I think) the number of times the
wheels turn for a specified distance. I remember doing the measurement for
only a tenth of a mile. Nisonger in NY state did the rebuild and
recalibration. The result was wonderful. Not only was the speedo as
accurate as you would need for any normal use, but the rebuilt speedo looked
brand new. I think the cost was $100. On the West coast, I believe that
Palo Alto Speedometer could do the same thing. Both advertise in Hemmings.
Just talk to them about the necessary measurements.
2. Tiger Tom posted about a less expensive method of changing the
calibration by installing an in-line reducer in your speedo cable. I did
not try this method, but I think it depends on your knowing the specifics of
the current calibration of your speedo and the needed calibration with OD,
your tire size, etc. Since I wanted the cosmetic rebuild anyway, I thought
it was easier to just figure out how many times the wheels turned.
Hope this helps.
Steve Semeraro
This archive was generated by hypermail 2b30 : Tue Sep 05 2000 - 08:39:10 CDT