Wiring harness on a diet

[smokin247]

I'm having trouble figuring this out on my own.. I'd like to remove as much wiring as I can from under the hood. I removed the air conditioning and stock fuel system wiring. Only things I'm worried about still working is my gauges and heat. What can I remove from my pcm harness?
And one related question.. do I need my vacuum line for my heat and vent control to work?

 

[95cummins5.9]

Yes on the vacuum line unless you changed what actuated it.