I've looked all over the forums and I can't find the answer to my problem in particular! Car is an 84 633csi.
Please help!
-Speedo jumps upon ignition but doesn't work.
-MPG Gauge swings wildly from one either one end to the other upon applying throttle/letting off.
-Temp gauge works most of the time but will sometimes just fall loose until I turn off and turn on the car.
-Odo is completely dead.
-Tach works perfectly though!
-Cluster lights work intermittently.
I've already REPLACED the speed sensor on the diff!
Help please!
Edit: All the gears (including the small one) have been replaced.
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Last edited by SethBerg; 08-09-2017 at 02:44 PM.
Sounds to me like you need a new SI board. The motherboard eventually goes kaput. I know: I need a new one too on my '87. Programma is the only company that still makes the boards (refurbished) You'll need a new odo gear kit too. It's all fairly inexpensive but a ton of work. I defer to others on speedo. Check online for programma boards & odo kits. Odo is a very patient, bench job. Good luck....
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'87 635Csi Black/Pearl
"Sabine"
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