I'll be interested in reading the replies also. Mine has been doing that for the last year. Idles at 0 - 250 rpm, 2500 for shift points. I bought a replacement instrument cluster but haven't gotten around to swapping tachs. Had a similar problem on my Volvo and it turned out to be resisters on the back of the tach that went bad. In that case it was sent out for a rebuild.
Gene
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Gene and Ben
1992 SVX LS AWD 110K - Liquid Silver
1994 SVX LSi AWD 128K - White Pearl (daily driver)
1994 SVX LSi AWD 95K - Emerald Pearl (sold)
1992 SVX LS-L AWD 115K - Dark Teal 4.44 swap (sold)
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