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There are six loose wires in the harness that also need to be tended to. From left is a red/white wire that connects to a 12V switched source, a green wire for the fuel pump, a white wire that us not used, a solid red wire that needs to be connected directly to 12V battery power, a black ground wire, and a yellow coil wire. There are specific instructions on where to connect the yellow wire given each particular setup (standard canister-type coil, non-HEI). For our system, it goes to the negative terminal on the coil to provide engine speed input to the ECU.