Anybody got a broken TD5 speedo?

I've just spent the afternoon interfacing between a TD5 clock and some 5v electronics building a device to alter the mileage to the correct figure and allow me to calibrate the speedo for different tyre sizes then when I get it started the odometer works but the speedo went up and wouldn't go back down......

So I took the TD5 speedo apart and the motor has gone for the needle. So anyone got a broken clock?

Got a spare working one, how about doing a swap, I send you it and you send me a speedo calibrator in exchange once you get the design finished and working?

Kwakerman said:

Got a spare working one, how about doing a swap, I send you it and you send me a speedo calibrator in exchange once you get the design finished and working?

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You're on. I have the prototype already working on the bench. It will also allow you to roll the mileage up to a figure of your choosing but at 1500mph! You can't roll it back without taking the speedo apart though. I'm also looking at including a few other gizmos in it which I'll sort for you.....

With the correct kit it's fairly easy to flash the EEPROM with the correct mileage and also a different turns per mile calibration.

There's a good thread on LR4x4 about it where some clever folks reverse-engineered the interface/software.

Retroanaconda said:

With the correct kit it's fairly easy to flash the EEPROM with the correct mileage and also a different turns per mile calibration.

There's a good thread on LR4x4 about it where some clever folks reverse-engineered the interface/software.

Click to expand...

..... and I have that kit and have seen the thread BUT cutting one wire and fitting a male spade to one end and a female to the other then attaching them to a small black box then taking an ignition live and ground to the same black box is MUCH easier for most people (it can also be instantly reversed by removing the black box and pushing the two spades together). The small black box is almost infinitely variable in that it will actually measure the number of pulses in a fixed one mile therefore giving you a completely accurate speedometer and odometer. It will also allow you to re-calibrate in a few minutes when you change wheels. They are two ways to crack the same problem but this way is MUCH cheaper and simpler. I'm also going to use some of the spare IO pins to add other features such as an output to a central locking interface to auto lock the doors when you reach 10mph; a pin to the alarm which will set off the alarm if the car is moved and if I can find a way to measure the fuel use I can do an accurate fuel computer too.