[DeTomaso] Speedo conversion from miles to kilometers

[The Goyaniuks]

I purchased a KPH speedo from Hall to replace my MPH speedo.
As an added benefit my "mileage" went down by about 30,000 to 0.  I just got a new car !
Julian summarized the challenges associated with having the speedo read correctly as there are a number of drive, speedo and tire size issues that have to be dealt with.Our 71-74 cars drive with tires sized somewhat different than the originals.To correct the speedo error, I installed an inline speedo gear drive.To get the right ratio, I drove 100 kilometers and looked at the odometer reading for that distance.Then taking 100 and dividing it by the odometer gave me the gear ratio I needed for a kilometer reading. 
HTH
Bohdan

      From: Julian Kift <julian_kift at hotmail.com>
 To: Patrick HALS <patrickhals at gmail.com>; "detomaso at server.detomasolist.com" <detomaso at server.detomasolist.com> 
 Sent: Friday, March 3, 2017 2:02 PM
 Subject: Re: [DeTomaso] Speedo conversion from miles to kilometers
   
  Patrick,

  It is certainly do-able as my GT5 was an Euro import and the
  speedometer changed from kph to mph. Hall sells a Euro kph faceplate.
  [1]http://hallpantera.com/cgi-bin/p/awtp-product.cgi?d=hallpantera-inc&
  item=21227

  Some things to be aware of that I learnt from trying to get my speedo
  to read correctly;

  There were 2 manufacturers of angle drives VDO and Borletti and both
  available in mph (1:1 ratio) and kph (1.1:1 ratio). These are matched
  to two different speedos one is 1600 rev/mile (kph version) the other
  1200 rev/mile (mph), so if you have the US speedo & drive and insert
  the kph faceplate the indicated speed will likely be off from actual.
  This may be further compounded if you have non stock wheels and tire
  diameter.
  You could measure speed with a GPS, mark where the speedo needle is and
  have a custom faceplate printed to match. Another option is use of an
  inline gear reducer to correct the offset, these are fairly common and
  readily available.
  There are also options available that convert an old speedo to a modern
  GPS unit.

  Julian
    __________________________________________________________________

  From: DeTomaso <detomaso-bounces at server.detomasolist.com> on behalf of
  Patrick HALS <patrickhals at gmail.com>
  Sent: Friday, March 3, 2017 10:34 AM
  To: detomaso at server.detomasolist.com
  Subject: [DeTomaso] Speedo conversion from miles to kilometers

  Is it possible to convert US speedometers ( in miles ) to the original
  European "face" in kilometers ? Does anyone of our favorite vendors
  sell
  these ?
  Thank you !
  Pat

References

  1. http://hallpantera.com/cgi-bin/p/awtp-product.cgi?d=hallpantera-inc&item=21227

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-------------- next part --------------
   I purchased a KPH speedo from Hall to replace my MPH speedo.
   As an added benefit my "mileage" went down by about 30,000 to 0.  I
   just got a new car !
   Julian summarized the challenges associated with having the speedo read
   correctly as there are a number of
   drive, speedo and tire size issues that have to be dealt with.
   Our 71-74 cars drive with tires sized somewhat different than the
   originals.
   To correct the speedo error, I installed an inline speedo gear drive.
   To get the right ratio, I drove 100 kilometers and looked at the
   odometer reading for that distance.
   Then taking 100 and dividing it by the odometer gave me the gear ratio
   I needed for a kilometer reading.
   HTH
   Bohdan
     __________________________________________________________________

   From: Julian Kift <julian_kift at hotmail.com>
   To: Patrick HALS <patrickhals at gmail.com>;
   "detomaso at server.detomasolist.com" <detomaso at server.detomasolist.com>
   Sent: Friday, March 3, 2017 2:02 PM
   Subject: Re: [DeTomaso] Speedo conversion from miles to kilometers
     Patrick,
     It is certainly do-able as my GT5 was an Euro import and the
     speedometer changed from kph to mph. Hall sells a Euro kph faceplate.

   [1][1]http://hallpantera.com/cgi-bin/p/awtp-product.cgi?d=hallpantera-i
   nc&
     item=21227
     Some things to be aware of that I learnt from trying to get my speedo
     to read correctly;
     There were 2 manufacturers of angle drives VDO and Borletti and both
     available in mph (1:1 ratio) and kph (1.1:1 ratio). These are matched
     to two different speedos one is 1600 rev/mile (kph version) the other
     1200 rev/mile (mph), so if you have the US speedo & drive and insert
     the kph faceplate the indicated speed will likely be off from actual.
     This may be further compounded if you have non stock wheels and tire
     diameter.
     You could measure speed with a GPS, mark where the speedo needle is
   and
     have a custom faceplate printed to match. Another option is use of an
     inline gear reducer to correct the offset, these are fairly common
   and
     readily available.
     There are also options available that convert an old speedo to a
   modern
     GPS unit.
     Julian
       __________________________________________________________________
     From: DeTomaso <[2]detomaso-bounces at server.detomasolist.com> on
   behalf of
     Patrick HALS <[3]patrickhals at gmail.com>
     Sent: Friday, March 3, 2017 10:34 AM
     To: [4]detomaso at server.detomasolist.com
     Subject: [DeTomaso] Speedo conversion from miles to kilometers
     Is it possible to convert US speedometers ( in miles ) to the
   original
     European "face" in kilometers ? Does anyone of our favorite vendors
     sell
     these ?
     Thank you !
     Pat
   References
     1.
   [5]http://hallpantera.com/cgi-bin/p/awtp-product.cgi?d=hallpantera-inc&
   item=21227
   _______________________________________________
   Detomaso Email List is not managed by POCA
   Posted emails must not exceed 1.5 Megabytes
   DeTomaso mailing list
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   [7]http://server.detomasolist.com/mailman/listinfo/detomaso
   To manage your subscription (change email address, unsubscribe, etc.)
   use the links above.
   Members who post to this list grant license to the list to forward any
   message posted here to all past, current, or future members of the
   list. They also grant the list owner permission to maintain an archive
   or approve the archiving of list messages.

References

   1. http://hallpantera.com/cgi-bin/p/awtp-product.cgi?d=hallpantera-inc&
   2. mailto:detomaso-bounces at server.detomasolist.com
   3. mailto:patrickhals at gmail.com
   4. mailto:detomaso at server.detomasolist.com
   5. http://hallpantera.com/cgi-bin/p/awtp-product.cgi?d=hallpantera-inc&item=21227
   6. mailto:DeTomaso at server.detomasolist.com
   7. http://server.detomasolist.com/mailman/listinfo/detomaso