3.46 Diff Help

[ruqknuf]

Bolted up a 3.46 LSD in my ETA. Ever since then my speedo and tach gauges have been acting haywire. I'm to assume the speed sensor in the diff needs replacing. (btw- replaced my gauge cluster with a confirmed working one and act's exactly the same) What cars were these standard? Need to search real oem for this part.
Another question - The wire harness that plugs into the sensor, are they all the same (universal) ? ?

[e30rapidic]

I swapped a 3.46 into my e30 without issue, came from a 6 series. The diff has a ring in that the sensor reads. To be safe, I swapped the known working sensor in from the previous diff. Also check to make sure your wires at the sensor aren't arcing as they can be brittle.

[ruqknuf]

I swapped a 3.46 into my e30 without issue, came from a 6 series. The diff has a ring in that the sensor reads. To be safe, I swapped the known working sensor in from the previous diff. Also check to make sure your wires at the sensor aren't arcing as they can be brittle.

Ok great - will do.

[jlevie]

A flaky speed sensor would affect the speedometer, but would not affect the tachometer. You could have a problem with the speed signal to the cluster, but there is a different problem that is affecting the tachometer.

[ruqknuf]

A flaky speed sensor would affect the speedometer, but would not affect the tachometer. You could have a problem with the speed signal to the cluster, but there is a different problem that is affecting the tachometer.

Could it have anything to do with installing an "I" cluster in an ETA ? ?

[jlevie]

Could it have anything to do with installing an "I" cluster in an ETA ? ?

Not per se. But there could be problem inside the cluster.