so are you using mk2 or mk3 clocks?
if mk2, you have 2 options.
1. chop the mk2 coil plug off, remove the brown wire entirely. then either fit the black wire to the coil +ve, or remove it entirely and swap over the mk2 coil live wires. i do this as the mk2 coil wires are a bit thicker than the mk3, though tbh mk3 wires probably fine. next you run the coil -ve wire to the fusebox/clocks, and fit the mk2 tci unit and loom as per factopry. splice the mk3 red/green wire to pin 6 of the tci and job done. if the tci loom was from carb/k-jet 8v, then the other 2 wires to the dizzy are no longer used and can be binned.
2. open the mk3 coil and run your rev counter wire from the -ve side to your dash/fusebox.
I prefer option 1 as the MK3 coils are sh!te
