[henriklarsen101]

I have a problem with my rev limiter/counter, which seems to be having a mind of its own.



When it does decide to work its a bit "jumpy and not very "smooth" and then it just suddenly stop working only to start again suddenly. I have noticed that sometimes driving over a bump on the road will get it going again, which to me indicate a loose connection but.............what do I know??



I had the car serviced at an Independent Porsche Specialist a couple of weeks ago, which (obviously) spends most of his time on 911's (not many 968's in my neighborhood).



He only billed me two hours for the service + oil, filter etc. so obviously didn't spend very much time on it (could he

actually check the instrument cluster in such a short time?), He suggested I try source a new (2[sup]nd[/sup] hand) instrument cluster as he said he didn't think it was a "faulty connection".

Before I go down that route, has anyone experienced this before or something similar?



Also, if I do get a new cluster, is it possible to set the milage/kms odometer so it matches my current one and the miles the car has done?



Any advice will be hugely appreciated in this respect.



A side issue which [size=4]I don't expect it to be related - the trip-meter works most of the time but once in a while it gets stuck and then the odometer doesn't tick over either. Several pushes on the "reset" button eventually gets it going again.[/size]

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[flash]

have you had anyone check the codes?



as for the odometer, i'd check the connections at the back of the cluster, but you could be losing the gear in there. pretty common.

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[link517]

If there is no available 968 cluster, 944 clusters seem to be plug and play (and much cheaper). As for the ability to interchange gauges, all 944 speedometers( 160 mph and 180mph) are different than 968 units. The gas/coolant gauge is interchangeable between clusters, however one from the 944 turbo has an added brake pad sensor light. As for the ODO/tripmeter, i am working on the same problem, I installed a new cluster and the tripmeter stopped at 4.1 miles. Back to the drawing board for me at least...

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[flash]

they are not really plug and play. some of the wiring is different. it's in the traces on the blue ribbon on the back.

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[link517]

Very true, to be more clear when i said plug and play, i was referring to then ability to determine whether the issue was due to the gauge/cluster itself or due to wiring.

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[Eric_Oz_S2]

Your tripmeter and odo problems are probably related to the usual gear failure - they disintegrate with age. Same happened on my S2. It is a relatively easy fix and only costs about $10 for the gear.



They go bad like pic below:







The rev counter could probably be a result of dry joints in the pc board on the tacho. Unlikely that it is a loose connection, as the ribbon cables are fairly well attached to the instrument cluster. Most probably the tacho is on the way out. Other possibility is a loose earth, although if your other gauges are working that is probably unlikley. Fairly easy to change the tacho, and you could use a 944 one, although the redline is different.

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[henriklarsen101]

Thanks for the advice so far.



Just to clarify a couple of things:



The tripmeter/Odo is likely to be gear related and is a straigh forward fix.



With regards to the rev counter "it may be a result of dry joints in the pc board on the tacho" - can that be rectified or is there "no way back"?



(I only have a problem with the rev counter, all other gauges seems to be working fine so not "loose earth")



Also, Flash; what do you mean by "checking the codes"?



With regards to getting the instrument cluster out to check these things - can anyone direct me towards a "user guide" for this?



Thanks again for the help.



PS: If I do have to go for a new cluster, does anyone know if it is possible to set the kms on the odo so it matches the kms the car has actually done?

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[flash]

i was referring to plugging in a diagnostic tool (durametric or bosch hammer) and seeing what it said,but now that i go back and reread this again, i'm not sure why i thought that was germane - lol

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[flash]

now i remember. it was the "rev limiter" part that got me thinking. if the rev limiter is fluctuating, then there might be something wrong that a code would show. if it's just the odometer though, then it wouldn't.

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