Jim McKinney

Hello all, first post here - and I have searched for roughly an hour or so, but I hope you guys will be able to answer my question quickly. I have the pertronix and flamethrower combo and wired it like you diagrammed above with the ballast resistor out of the circuit and its working wonderfully. I bought the car on saturday and the BR was wired in....and it ran very very poorly. My question is, now that I have it running well, my tach does have a little trouble over 5k or so, and I want to install the MSD 9820 Tach Adapter, but all of the diagrams I see for it refer to folks using the MSD 6A system, which I don't believe I have. Using this diagram you posted, where would I wire in the tach adapter? Thanks in advance! -Jim