Re: diagnosing a dead tachometer? - Saab 900 Bulletin Board - Saabnet.com
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You could also check the signal wire from the ignition back to the tach. The only wiring drawings I have any more are '89 so that doesn't help. Check townsend's site, there's quite a lot of wiring drawings there.
It's an '85 like your username?? IIRC, that's the year with crumbling insulation in the wiring harnesses? A short to ground in the tach signal wire would send your tach to zero.
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