Author Topic: Digital Odometer Readings on Swapped Speedometer  (Read 3012 times)

bflink

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Digital Odometer Readings on Swapped Speedometer
« on: January 11, 2014, 11:16:38 PM »
I am trying to change the tank-mount speedometer on my 2002 Heritage Soft tail Classic which has 2504 real miles on it. I purchased a used dual-reading mpg/kmh speedometer on eBay that has 741 miles registered on its' odometer (bike is imported to Canada and requires kmh speedometer which HD no longer makes.)

I watched the very helpful YouTube video about installing a new speedometer on a soft tail but it raised a few questions for me. Like I said, my speedometer is used and has a different # of miles on the odometer. I didn't get the special communications cable that transfers the real bike odometer reading to the new odometer. If I install the replacement speedometer without using this cable, what mileage will the used odometer read after I install it? I'm concerned that it's programmed not to work without the information transfer step or that the odometer reading will be some other crazy value. The actual swap looks easy but I'm concerned about what reading- if any- the replace speedometer's odometer will give.

What do you advise that I do?

smallengineshop

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Re: Digital Odometer Readings on Swapped Speedometer
« Reply #1 on: January 28, 2014, 11:26:21 PM »
I don't think there is an easy way to change the odometer reading on a used odometer. You might be able to use a special tool to change the odometer reading, but I don't think HD supports or provides a method to change the odometer. When I say special tool I am talking about electronic tools like Digiprog 3, Digimaster 3 or Tach Pro.

Can you give me more information about the odometer like the manufacturer, serial or model number. HD does not make the odometers they sell. I would recommend contacting the manufacturer for more information. Digiprog 3 provides a pdf that shows how to change the odometer reading on a few HD bikes. Good chance your odometer contains the same chip as the one in the instructions, but all the instructions are written in German I think. Here is the link:

http://pdf.auto-tool-shop.net/digiprog-iii

John 3:16 For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.

smallengineshop

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Re: Digital Odometer Readings on Swapped Speedometer
« Reply #2 on: November 09, 2014, 05:21:40 PM »
Since I last posted on this thread I have learned more about the Harley Davidson speedometers and tools used to rollback the odometer. It is possible to rollback the odometer on Harley Davidson electronic speedometers, but it requires special tools to access odometer data on EEPROM memory chips, and some speedometers on other vehicles store the information on micro-controllers. I was never interested in changing the odometer, but I did want to find a method for unlocking the speedometer, so the speedometer can be used on another motorcycle.

Some tools that will work to change odometer data on electronic speedometers are the Tacho Pro, USA Prog and DSPIII+. All these tools are manufactured in China. The Tacho Pro is the least expensive, but the software is no longer supported and you can't get updates for the tool, and I have heard several people online complain about the tool not working for some applications and destroying the speedometer, so be careful with this tool (I am not positive the TachPro will even work on HD Speedometers, so be careful with this one). The reason the Tacho Pro is so cheap is because the software is old and you can no longer get updates, and the instructions included with the tool are very poor and difficult to understand. The USA Prog and DSPIII+ is up to date and more reliable than the Tacho Pro, but they are very expensive. The cheapest package for the USA Prog is $500 and the accessories you will need are extremely expensive, so look to spend over a minimum of $1000 on this tool. The most expensive verion of the USA Prog is around $5300 and it is called the Full Version. Same story with with the DSPIII+. Its very expensive!

There is a program called TachoSoft Mileage Calculator that will run on your PC. The program will take your mileage and encode it into hexadecimal form, tell you what type of EEPROM chip your speedometer uses, and where the odometer data is stored on the EEPROM chip. All the EEPROM chips I have seen used on Harley Davidson electronic speedometers use a 93CXX chip. With the information given to you by the TachoSoft software you can basically use any EEPROM programmer with the proper zif socket to change the memory contents and write the information to the EEPROM chip. So with the Tachsoft program you will have the encoded odometer information, and where it is stored on the EEPROM chip, and with the programmer you can read the contents of the EEPROM chip, make changes, than write the information back to the chip. This is the cheapest solution I have found for changing speedometer information. Its possible to make your own programmer, but programmers are only around $100, and you can buy programmers that plug into your PC's USB port. In my opinion this is cheaper and much more convenient than trying to build your own programmer.
« Last Edit: November 09, 2014, 05:25:46 PM by smallengineshop »
John 3:16 For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.