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Dear dnice,
Good p.m. and may this find you well. I think Park is right. If the problem were in the instrument cluster, the tach would be erratic in general. Even so, in the event that the problem is in the cluster, I venture to offer some guidance.
While I've never removed an instrument cluster from a 960, I just removed one from a 1993 940, cleaned the inside of the clear plastic face, and reinstalled it. Everything still works.
If the 960 is similarly arranged, use the FAQs for the basic procedure. If you're right handed, it is easier to remove first, the right (passenger) side of the aluminum bezel; the left will then disengage.
As the FAQ procedure states, four Torx screws (T-25) must be removed. Then, the cluster has to be moved over two spring clips at the bottom of the opening. This is actually a little harder to do, than anything else in the procedure.
Reach behind the cluster and grasp the wire harness and pull it very, very gently towards you. Do not - under any circumstances - pull on the cluster itself. If at all possible avoid touching the flexible circuit card: it seems fragile.
Once you have some slack in the harness, disconnect the connectors. You will know instantly if that which drives the tach is loose. I do not know how many or what type of connectors are used on the 960 cluster. I do know that on the 93 940 cluster there are several, of different types. On the 1995 940 cluster, there are three of the same type, plus a single spade connector.
On the 1993 and 1995 940 cluster, the bulbs are in a row at the bottom of the cluster. Each bulb is separate. I doubt you could have shaken them loose. It is, though, possible that the tach connector has worked loose.
If you want to clean the inside of the face of the cluster, you should remove the phillips head screws around the cluster's perimeter. There may be two more screws - in the lower third of the flexible circuit board - that must be removed, to get at the face of the cluster from the inside.
On the 1993 cluster, these two additional screws are located at positions 8 and 16. On the 1996 cluster these screws are at positions 7 and 16. Once these screws are removed, the circuit board and instruments will come free of the cluster face. You can clean the inside of the clear plastic lens with a soft cloth and window cleaner.
Re-assemble in reverse order. As the FAQs state, put a little grease on the spring clips that secure the aluminum bezel. That will make it easier to remove the cluster, if there's a need to do so.
Hope this helps.
Yours,
spook
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