I have a 1990 Corvette Convertible and the tachometer seems to indicate about 300% in error. My tach on the instrument cluster reads 2100 RPM's at idle and my OBD I scanner reads 700 RPM's. Is there a fix for this problem or a common cause.
I'll try it. In 1990 the guages in the instrument panel went back to Analog, the only digital readout is fuel guage, speedometer, and odometer. Would the diconection of the battery reset analog guages? I have heard that the 1990 & 1991 Vettes have a common problem with the tach's, but have not heard of a fix yet.
There is a thread here somewhere about this and I am having trouble finding it. There is a fix for this hang in there. If I can't find the thread I'm sure that someone that is smarter than I will help out.:laughing: