My tachometer has died as well. I noticed last month that is was reading very low, despite engine rpms being high. The gauge has some serious condensation in it now and will not function at all. The hour meter is no longer functioning either. I may have to investigate the fuse. Is it located behind the panel or closer to the engine itself?
If I have to replace the gauge, I see Volvo wants $478.00 for one. I can't imagine what the whole panel would go for...
Jake
2004 Bav 44