On my search for a tach I came across another good idea: A guy in Germany is selling brand new tachs which he modified to take the signal off the alternator. No amplifier needed at all. For those who speak German, here's the link:
 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=180198007241&ru=http%3A%2F%2Fsearch.ebay.com%3A80%2Fsearch%2Fsearch.dll%3Ffrom%3DR40%26_trksid%3Dm37%26satitle%3D 180198007241%2B%2B%26category0%3D%26fvi%3D1
Slightly overpriced, though, but this is only for the idea.
techguy512: The 'cigarette butt fix' is most likely the cause of my destroyed tach.
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'99 S420, 155k
'91 VW Vanagon GL, 150k
'85 VW Vanagon GL, 120k
'82 VW Westy, aircooled, 165k
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