i dont think anyone makes it for the CA, Haltech Australia have a CA powered datsun so maybe they will wire up a custom harness for you,
but the best solution would be to get a flying lead harness and wire up all the sensors etc from scratch it saves allot fo time tracing wiring problems and can be done neatly and hidden nicely,
I have a E6k and used my OE CA harness and just wired in the sensors i needed, cut off the big blue ECU plug and wired everything up to the Haltech plug.
if i could do it again, i would get the flying lead harness and no it nice and neat. itys pretty easy once you have the CA FSM and haltech pinouts.
here you can get haltech stuff in UShttp://
www.racetep.com/haltech/halweb0804.htmgood luck.