I just installed a new auto meter tach. In my 75 dart 318 se went to start it no power redid battery twice finally got it to crank but it won't hit. So I check positive voltagage at the coil which registered at 5.7 so I run full battery power to coil still won't hit. And the coil wire is brand new and has good continiuty, coil has good ground. New cap and rotor, it is getting fuel and finally the coil ohms out good and has good continiuty from+-..... any other ideas that this problem could be????????