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1990, When car starts Tach needle swings all the way up like a self tests, then drops down to bottom. Also gas gauge gauge does not show any bars, tank is full and DIC do not work. CCM ?
 

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When car starts Tach needle swings all the way up like a self tests, then drops down to bottom.
CCM ?
Gauges don't run through CCM

Tacho problems well documented in 90/91 cars
http://forums.corvetteforum.com/c4-...-tachometer-filter-replacement-1990-vert.html
http://forums.corvetteforum.com/c4-general-discussion/2628578-tach-filter.html
http://www.thirdgen.org/techboard/electronics/569350-1991-z-tach-reads.html

Also gas gauge gauge does not show any bars, tank is full
Also common problem with age
http://forums.corvetteforum.com/c4-...l-gauge-sending-unit-repair-tech-article.html
 

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