Hope someone can help. i have a 69 camaro with a MSD ready to run ignition and blaster 3 coil, here is my problem..... i have 12 volts to the red wire to the key switch. when i turn the key on i have 10 volts on the assessory wire(pink) going out to the positive side of my coil. Where am i dropping 2 volts? the car starts and runs fine but my tach now jumps all over the place. i ran 12 volts to the 12 volt switched line on the tach and it seamed ok but i didn't run it very long that way. sometimes the tack is ok and sometimes it bounces around. Would a tach filter help? and how many volts should be on the neg side of the coil. i have the same as the pos side, about 10 volts. is there another place i can pick up 12 volts switched? any info would help....thanks