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Spiking Tachometer

Electrical

Vehicle Information: Year: 1982; Engine (Size, Modifications): 3.3 (k27, 1bar, andial enrichment & intercooler, perma tune); Total Mileage: 62000;

Stephen, I searched the posts regarding tach spikes but none match my condition. I had the charging system tested 3 times within 2 weeks and all tests were ok. The tach is fine at idle but at 3-4k bounces up and then back down to proper range. Also, when I put the windows up from fully down it spikes up all the way over to 6k. Motor runs fine. Any suggestions? Thank you.

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