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I've got a 5.0 EFI engine in my 66 and am trying to get my tachometer hooked up. The wire i need to connect goes either to the coil or the EEC-IV, the directions for installation said to connect to the tach connection on the computer if available but i looked and did not see any connection. I cannot determine which wire to connect to on the coil itself. I know it is supposed to go to the negative side of the coil but am not sure which one is negative. I would appreciate some help on identifying the difference in positive and negative. I looked at a pin table for the computer and it shows what pin the wire is coming from but i havn't traced it back but suspect it will go back to the coil. Any help is appreciated
Thanks jwtaylor, problem solved. The stamped marks were located at the bottom inside the female connector and the negative wire on mine was yellow with a dark green stripe. Thanks again!
http://www.msdignition.com/downld1.htm this link will tell you all your tach,dist.,ignition boxes wiring with scematics,you can download it as a pdf file! good luck!