I don't know how to tell for sure what instruments you have, other than to suggest that you get the BMW part no. from it, and check it out using a BMW parts disc (which I don't have, but I'm sure others who post on here do).
-your instrument panel may be from a 628 (or a similarly more basic E28 5 series model) which is similar but wouldn't necessarily have had the ABS fitted (I think). From what I recall your car has had a lot of replacement parts and has done a lot of miles so it wouldn't surprise me if the instrument panel has been changed; they usually need something doing to them at some point and it would be a miracle if yours hadn't needed something by now. The most common instrument fault is the back-up NiCd batteries, so you may as well check these too.
-incidentally, the speedo, the direction indicator light tell-tales, the high beam, front fog and rear fog indicator lights all share a common ground connection, via #16 on the panel. This might be at fault (although if it is then it is hard to see how the LH indicator tell-tale would work).
-The wiring to pins #8 and #12 should read intermittent continuity from the speedo sensor on the diff housing when the rear wheels are turned (have someone jack up one side of the car and turn a rear wheel). If there is never continuity the speedo will never read anything.
-pin 12 should look a bit volty with the ignition ON. If not the speedo has an internal fault or fuse #12 has blown.
-also, if you have a 635 your car is an E24, not an E28; it is just mostly based on E28 mechanicals from mid '82 on.
-I hope this helps
cheers
635 Dashboard Fault
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