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[Andy H]

There are a few old threads about complete failure of Speedo & Tacho. The symptoms being that ABS & TC still work as normal, all the warning lights still work but the needles on the speedo & tacho just tremble a little without getting off the stops.

Did anyone have a decent fix for this? Someone posted about having researched the chips that convert speed pulse and ignition pulse into needle position but they didn't get very far.

My reason for asking is that I now have a project MV6 that appears to have this problem. James fitted a good cluster for me but I would like to keep the original cluster (and the original indicated mileage) if possible.

[iliak]

Does speedometer needle tremble when your car doesn't move?
Also, does odometer work?

[Doctor Gollum]

Cure is a n other cluster.

BBA Reman or similar might be able to repair the old one, assuming that the can locate and access the broken bit

[Andy H]

Does speedometer needle tremble when your car doesn't move?
Also, does odometer work?

I don't know. The original cluster was swapped out before I received the car (and is now on the back seat)

I haven't taxed or insured the car yet & probably won't be able to drive it until January.

[Andy H]

Cure is a n other cluster.

BBA Reman or similar might be able to repair the old one, assuming that the can locate and access the broken bit

James fitted a n other cluster which apparently works fine but the odometer reading is less than the original and I am puzzled as to why the range is reading 16 miles to empty but the fuel gauge is reading just under 1/8th full and the low fuel lamp hasn't come on.

I seem to remember there being a guide to deciphering the coding of the MFD - I will have a look & see if I can find it.

Not keen on sending anything off to be repaired - the fault sounds like one caused by the failure of a 20p chip that that I could easily change myself.

[iliak]

I see.
Both speedo and tacho have tiny, really small plastic gears inside. Sometimes these tiny little gears fail (crack, etc), just because of old age. The important thing is that if that's the case, the speedo needle won't move when car stops. That's why I asked my question.
I've seen a man who managed to repair it himself, but he's an amatour watchmaker

[Andy H]

I see.
Both speedo and tacho have tiny, really small plastic gears inside. Sometimes these tiny little gears fail (crack, etc), just because of old age. The important thing is that if that's the case, the speedo needle won't move when car stops. That's why I asked my question.
I've seen a man who managed to repair it himself, but he's an amatour watchmaker

From what I have read it will be an electronics problem not a physical problem

[Andy H]

I can only find this guide MID codes for the MID coding and it only covers pre-facelift codes

[terry paget]

Sounds like you need another speedo tacho assembly. I don't know how many variations there are. I expect I have one off a 2.5 petrol manual in my heap which might fit. Would saloon or estate affect the fuel gauge? What colour is the connector to the computer thing?

[Doctor Gollum]

Saloons do indeed have a smaller tank, so the tank calibration will be off... in theory it should under read

Is the MID original to the car or the cluster? If the original cluster still has it fitted, swapping them over should sort everything but the range, as this factors the gauge

[TD]

Unless the cluster came from another 3.2 MV6 Estate, then it is going to be getting readings wrong.
Sounds like the cluster needs a chat with a tech2 to configure it for the MV6. 

[terry paget]

I beg pardon. I initially misread your post and thought you did not have a reading speedo & tach. I now grasp that you have working speedo & tach, but wrong reading mileage total (small beer surely) and wrong reading range and possibly fuel range. Since estate and saloon tanks are quite different shapes this is not surprising. Do we know if James substituted a speedo/tacho/computer from a similar vehicle?

[omegod]

I have a spare cluster from a 2.6 estate if it's suit

[Andy H]

Thanks for the offers of replacement instruments

Before I do anything I would like to establish what is currently fitted as it appears to work OK.

This is the coding screen for the instruments currently fitted.



Presumably I could just swap the MID from the original instruments if this one is coded wrongly to save a 400 mile round trip to my nearest Tech2 & intelligent operator

[Doctor Gollum]

Thanks for the offers of replacement instruments

Before I do anything I would like to establish what is currently fitted as it appears to work OK.

This is the coding screen for the instruments currently fitted.



Presumably I could just swap the MID from the original instruments if this one is coded wrongly to save a 400 mile round trip to my nearest Tech2 & intelligent operator

Precisely, as suggested last night