wiring harness

[blue beast j10]

I am going to need new wiring harness for 79' j10 I am thinking about elec. fan msd ign. or equivalent and TBI at some point was wondering what harness I will need to get? and am I missing anything?

[Ryan]

the 21 circuit we sell is for rigs with power windows & power door locks, otherwise, go with the 12 circuit.