It's broken... . Seriously, usually a bad connection in the cluster, either a ground or the lead for the tach or the multi connector plug. Did it quit suddenly or die a slow death?? I'm not 100% sure, but I think the tach picks up its signal from the ECU. The tach itself is nothing more that a fancy voltmeter. You can check it with a digital low voltage multimeter by checking the resistance across the two leads for the tach. Should not be zero or infinite.

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Jeff Lawrence
1987 300e
1989 300e
1987 BMW 325

[This message has been edited by jeffsr (edited 06-13-2000).]