speedo and rev counter not working

my speedo and rev counter have stopped working but everything else on the dash is working fine.

anyone have any ideas??

strange they have both stopped working at the same time , as the speedo is mechanical and the rev counter is electric!

The speedo gets drive from the gearbox via the speedo cable, so you need to check this 1st before suspecting the clocks.  Make sure its still connected to back of the clocks & is not broken or stuck and turns freely, also check the drive gear in the gearbox.

The rev counter gets a feed from the negative side of the coil, but cant remeber off the top of me head what colour it is (usually a green one but might be different on vw) make sure this wire has continutity from the coil negative up to the back of the clocks.

Also make sure you have a good earth between the back of the clocks and the rocker cover on the engine - a poor or broken earth here has been known to cause all sorts of problems!

Hope that helps



Ross

thanks man,

i thought it was odd too as i understood the speedo was mechanically drive.
ill check everything you said.

i found what was up with the rev counter, it was the wire to the coil. it looked ok but when i wiggled it, the wire seperated from the connector. easy fix.

now just the mystery of the speedo

my money is on speedo cable.  Take the clocks out, and drive the car forward and back a bit - you should see the square cable rotate inside the outer cable, if not the cable is broken, or the speedo drive gear has broken/disconnected from the cable

i think i found the problem with the speedo, annoyingly its the speedo unit itself.
now i gotta go on the hunt for a new one.

cheers rossirvine for your help

well it wasnt the speedo unit  
ive taken out the whole speedo cable and it all works, even when i connected it to the back of the speedo. its when im putting in the gearbox, thats where its not working. it feels like it seats itself but nothing happens when i drive.

any ideas??

its ok i got it working. i found it kept popping out of the box, so i bolted it down nice and tight. i can now tell how fast im going yey

:clap:  nice one dude!