as far as i know, there were 2 types of factory tripple guage system used regarding the taco wires
one had one wire to feed to the -tive terminal of the coil
& the other used a "loop" system with 2 wires through to the neg-tive terminal of the coil
so,,, your`s """Looks/seems""" to be the one wire type to me
sorry i`m not much help, but if there were 2 "bullet" type terminals avaliable & vacant on the back of that taco instead of the one "spade" type (plus the earth) then i`d say yours was the 2 wire type one
that`s all i got today , sorry