welcome to bimmerwerkz. the gauges problem could be your cluster starting to act up (common) next time the gauges die, try seeing if your wipers work properly (not on high , just on intermittent) the stalling could be any number of things but i think maybe it just stalled period, has it happened before or again since that time, i really cant comment on it because im really not positive what it could be, i dont think the gauges and stalling are related at all..
the coolent level could just be a sensor like you thought. next time your in for an oiil change or any other service, id get them to investigate further into those 3 things ... the gauges are an easy fix, there is a do it yourself in the FAQ forum.. the sensor as well is easy to do, save yourself some labour money
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