My tach is reading way high. It appears to be the original V8 tach. The following two articles say the tach can be calibrated: http://www.nastyz28.com/threads/tachometer-tester.306445/#post-3506108 http://www.howtoalmanac.com/kevin/projects/automotive/tachfix.htm Is that my problem or do I have one going bad that needs to be rebuilt? If so, who do you recommend? Thanks in advance!