The difference between my apex tach and vafc is 650 rpms. I think that will mess up my tuning. Can I run the rpm wire from the vafc to the same wire as my tach? Or is there anything else I can do to make it more accurate?

 

i dont think you can do much.. the vafc is electonicly controlled therfor more accurate, and the tach is mechanically-electronically driven so its off more thant he vafc.. i used to ahve a monster tach for racing, a vafc, and stock tach.. the most accurate was the vafc then the monster tach and then the stock tach.. since ive removed them..