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If the tach drops rapidly while the car is in gear and in motion, then the speed sensor is bad IMHO.
This happened to me once, and what stuck in my mind is that the engine can't drop RPM that fast without depressing the clutch... try it, just take your foot off the gas at 4k rpm, it will just drop slowly as the car slows down.
If you replaced these recently, then maybe they just aren't spaced correcty.
HTH,
Chuck.H
'89 TurboLookTarga, 342k miles
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