The steering angle sensor wouldn't have anything to do with the speedometer, so you can scratch that of the mental checklist. As for the bad DSC, they all fail individually and will exibit slightly different symptoms. If you want to be extra sure it isn't just the sensor you can swap it with the right rear and se if the fault follows.

As far as the left rear sensr circuit quitting, causing the speedometer to quit... It could be the cluster or the module, you got a 50/50 chance. I'd consider having diagnosis done by the dealer (and ask for a master tech) to see if there are any CAN bus faults as often the the module dropping out can cause can communication faults to be stored. The dealer has enough diagnostic resources to be able to better know which it is causing the issue through testing.

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2003 4.6is