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have a 90 C4, my volt meter was jumping all over the place, you could rev the motor and it would stop. Replaced the alt and it seems to have fixed it, but now my tach is reading about 800 rpm higher than normal. I was idle at 700 rpm and now it is 1500 rpm. Any ideas as to what is going own. I used the old alt as core trade in.
 

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have a 90 C4, but now my tach is reading about 800 rpm higher than normal. I was idle at 700 rpm and now it is 1500 rpm. Any ideas as to what is going own..
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Usually a fault with the electronics of tacho in cluster.Sometimes a new tacho filter will fix; in most cases not

http://forums.corvetteforum.com/c4-general-discussion/2628578-tach-filter.html
http://forums.corvetteforum.com/c4-...-tachometer-filter-replacement-1990-vert.html
http://www.thirdgen.org/techboard/electronics/357893-90-92-tachometer-fix.html
 
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