Speedo reading low

[Clacker]

Hey guys,

I've compared my cluster speedo to the speed warning unit and its lower by about 5kms. When I bang the dash it comes up and reads correctly.

I've tried soldering the voltage regulator as has been suggested but no good.

Is there anything I need to do to the speedo unit itself? I've tried resoldering the joints on the back but that didn't help either so I don't think it's a dry joint.

Thanks

[alex2_s]

yeah my vs needs a good bang over the dash to 'update' the dials as they all lag behind a bit except the tacho. try driving at a constant speed then slowing down i bet you if you hit it, it will drop down a bit more as its lagging behind the actual braking... heaps of commodores have this problem.

[Clacker]

yeah my vs needs a good bang over the dash to 'update' the dials as they all lag behind a bit except the tacho. try driving at a constant speed then slowing down i bet you if you hit it, it will drop down a bit more as its lagging behind the actual braking... heaps of commodores have this problem.

Yeah that's exactly what it does...does that mean that the mechanism needs lubrication?

Has anyone managed to fix this or do I need a new speedo?

BTW, Holden quoted me $470 just for the speedo unit!!!

[Clacker]

OK, I took the speedo unit apart including the centre threaded plastic guide and lubed it all up with silicon spray.

I also widened the hole slightly in the guide as it looked like I slightly bent the pin when removing the needle when I fixed my odo cog.

Put it all back and noticed that the needle operation was much smoother as it returned to zero.

I've just come back from a drive and it's about a 2km lag now which drops to 0-1km when cruising. I guess this is the best I can expect from a 300k cluster.

Hope this helps someone.