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just buy a premade loom like a painless loom

basically its a fusebox wires coming out of it all labelled

still theres plenty of work to do to get a cobra up and running

to give u a guide i take around 5 to 6 full days from start to finish for wiring up a cobra with an ls1

for a fusebox loom with labelled wires they can range from 400 to 600

to actually make a loom from scratch might cost u 200 to 300 in a fusebox and wiring and connectors

so easiest way is to get a ez21 harness just search for it on the net

u still need connectors terminals crimpers
special connectors for headlights
might need connectors for fuel pumps
l76 and ls2 need special plugs for ecu

there is probably afew few more tings to worry about but u forget them till u get to that spot when doin wiring

do u know how headlights and hi and low beam work
they are prob the only tricky bit

then u need afew other things for rego
like warning lights have to iluminate when ign is on and go away when u start
its called a buld check

paul unless u find a shop that sells connectors and stuff wholesale amd u buy it bulk yr better of buying a premade loom for around 400 then spend arund 50 bucks on connectors and terminals

rewiring a car is not cheap just ring your local auto elect and see what he quotes