Got a faulty speedo on my lads 90 TD5. Speedo needle is sitting straight down at 6 o clock position. Taken the unit out and I can hear parts rattling inside.

Theres a few replacements on ebay, but my question is, can a straight swap be done ? Does the speedo unit hold any mileage information, or is that all contained in the ECU ? If I replace a like for like, will the existing mileage be shown, and no discrepency fault .....

If I replace the speedo, Im going to open the old one up and see if its a fixable fault.

I believe the information is stored in the speedo unit. I've still got my original speedo, but I've been through several ECUs and it doesntl change the odometer.

Replacement bought, let's see how it goes...

Replacement arrived. Looks like a tomorrow job...