I have a mefi4b 12584052 controller . I have an ls1 ws6 trans am what harness do i need to fit this controller? part number please.

 

you need a mefi harness, contact howell electronics, i believe they have a harness for that app.

honestly though that engine management sucks, just run a factory pcm and harness... far better tuning capabilties and logging capabilties

 

I agree, it's a boat computer...