I am trying to put an HEI on my 72 chevy c-10. I have a stock distributor, cap and coil. however, there seems to be nowhere on the coil to plug in the tac or 12 volt switch. If ya got any ideas, let me know. If you need a few pictures or more info on the parts, hit me up. Id like to get this switched over soon as it is my daily driver. Thanks!