Finally got my coolant level sensor up and running this weekend. I installed it a couple months ago, following the procedure in the FAQ, but when it was all done I couldn't get the warning lamp to come on. I had neglected to purchase the Volvo wiring diagram...
When I got the wiring diagram this week, I instantly saw what the problem was. The wire from the sensor had to run to position #5 (rather than #9, where I had initially put it) in the 12-pin connector on the Yazaki instrument cluster:

And the results:

Moral of the story: buy that wiring diagram!
- Brian '93 945T
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